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No Outgoing Mail. Telnet Could not open connection to the host, on port 25

    Question

  • Hello,

    I would appreciate if someone could lend a helping hand. I run a small network with SBS 2008 which has Exchange 2007. Our SBS 2008 box is our mail server and has been working fine for just over a year.

    I believe that I have not been able to send mail externally since this last Friday. Coincidently, this happens to be the date when I installed SQL Server Express 2008 R2 on our SBS 2008 Server and my feeling is that this installation may have changed some of the Port/Firewall settings and I would like some help investigating Exchange Server.

    The new SQL 2008R2 instance (i.e. I still have SBSMonitoring on the default tSQL Server 2005) is configured on TCPIP Port 1491, away from the standard 1433 for the existing SQL 2005 instance. Furthermore, I created two new rules in the Firewall (Inbound and Outbound for Port 1491). I have not deleted any rules on the Firewall.

    This is as far as I have got and I am stuck:

    1. I have established Port 25 may now not be open. I have established this from the Server by trying to telnet to one of my providers.
      open mail.complyport.co.uk 25
      Connecting To mail.complyport.co.uk...Could not open connection to the host, on port 25: Connect failed
    2. Strangely, my Exchange Server is receiving external Mail.
    3. I have run a test on http://www.testexchangeconnectivity.com
      The only issue that came back was a final warning Attempting to find the SPF record using a DNS TEXT record query.  ExRCA wasn't able to find the SPF record.
    4. I don’t know if this is helpful, but when my Exchange Server was working fine, I was able to use Powershell to query the ExchangeServer. Now when I run the following command
      PS C:\> Get-ExchangeServer | fl
      I get the following error (I am not sure if the Exchange Module needs to be loaded?)
      The term 'Get-ExchangeServer' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
      At line:1 char:19
      + Get-ExchangeServer <<<<  | fl
      + CategoryInfo          : ObjectNotFound: (Get-ExchangeServer:String) [], CommandNotFoundException
      + FullyQualifiedErrorId : CommandNotFoundException
      This concerns me a little and I would appreciate if anyone has any ideas as to why this has stopped working?
    5. If I look at my Server Firewall Rules, I don’t see anything either in the Inbound or Outbound rules thathas SMTP in the name or any rule that has a Local or Remote Port of 25. The question here is whether I need to open a Port? If so, how can I audit who deleted the rule? How does it need to be set up?

    I have restarted my SBS Server (Hard reboot) hoping this would fix the problem, but it has not. I would really appreciate some help.

    Many thanks and kind regards,
    Bertie.

    Monday, June 25, 2012 8:15 PM

Answers

  • That would work yes :)

    Robert Pearman SBS MVP (2011) | www.titlerequired.com | www.itauthority.co.uk

    • Marked as answer by Bertie70 Wednesday, June 27, 2012 3:33 PM
    Wednesday, June 27, 2012 11:42 AM
    Moderator
  • OK,

    With the help of Robert Pearman, we established that the Sonicwall engineer accidently removed my NAT policy which when restored resolved the Internet connectivity problems. Robert was a fantasic help as he conferenced in on a call with the Sonicwall engineer to diagnose the outgoing SMTP mail flow problem as being due to a problem at my ISP gateway.

    Being the eternal pessimist, thinking that I know nothing about IT, I worngly assumed that it was deployment of SQL Server 2008R2 onto SBS 2008 that caused the problem and I think it was the building's network outage where come componentes on the Server have been replaced.

    Robert kindly temporarily patched my network with a Smart-host that we purchased from DynDNS. This will give me some breathing space to get my building ISP to restore my mail flow through port 25! Nice to have emerged from the ground and thanks everyone who chipped in with helpful comments.

    Very impressive "fire-fighting" service from Rob @ http://titlerequired.com/.

    Bertie.

    • Marked as answer by Bertie70 Wednesday, June 27, 2012 3:33 PM
    Wednesday, June 27, 2012 3:32 PM
  • Thanks, I believe my Network configuration is a bit of a special case situation as we take out line out to the internet from the Building as a package deal all inclusive with our rent. The problem is that they dont really have a dedicated IT Network specialist who can quickly resolve problems so at times, it feels like the blind leading the blind. (I am not prepared to change building yet though as I like my picturesque view out of the bay window).

    I am not sure if it is possible, but it would be great to see the ability to have multiple SendConnectors in SBS (I am not sure if this is currently possible). Rob @ http://titlerequired.com/ kindly reconfigured my Server to use a SmartHost and send mail out on port 2525 through DynDNS. I am hoping that when we track down the problem further upstream as to why port 25 is being blocked through my ISP, from my current understanding we will need to reconfigure SBS to send on port 25.

    Obviously, now that I have purchased an annul subscription to "Dyn Standard SMTP", I would like to have a preference where I route SMTP through my ISP, but if that fails, it then routes to DynDNS. I am not sure if this is possible in any of the SBS products.

    If there is anything further anyone would like to know about the resolution or my set-up, I am quite happy to try and post back.

    Many thanks and kind regards,

    Bertie.

    • Marked as answer by Bertie70 Thursday, June 28, 2012 8:28 AM
    Thursday, June 28, 2012 8:18 AM
  • It is possible to have multiple send connectors, though not sharing an address space as far as i know.

    Smtp Connector #1 - Send Via Dns smtp domains * (all) cost 1

    Will send all email via DNS.

    Smtp Connector #2 - Send Via SmartHost smtp domains @titlerequired.com cost 1

    Smtp Connector #1 - Send Via Dns smtp domains * (all) cost 2

    That configuration would route email to titlerequired.com via smarthost, and any other domain via dns.

    You can have multiple connectors defined, enabled / disabled / different costs etc.

    It might be possible to try to load balance, or have multiple connectors on a cost of 1, however i would suggest it is easier to have one active SMTP Connector, so you have less to troubleshoot.


    Robert Pearman SBS MVP (2011) | www.titlerequired.com | www.itauthority.co.uk

    • Marked as answer by Bertie70 Thursday, June 28, 2012 8:28 AM
    Thursday, June 28, 2012 8:23 AM
    Moderator

All replies

  • My first suggestion is to run the "fix my network" wizard on the SBS console
    I would also run the SBS BPA and see what's reported

    --
    Cris Hanna [SBS - MVP] (since 1997)
    Co-Contributor, Windows Small Business Server 2008 Unleashed
    http://www.amazon.com/Windows-Small-Business-Server-Unleashed/dp/0672329573/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1217269967&sr=8-1
    Owner, CPU Services, Belleville, IL
    A Microsoft Registered Partner
    ------------------------------------
    MVPs do not work for Microsoft
    Please do not submit questions directly to me.
     
     

    Cris Hanna, Microsoft SBS MVP, Owner-CPU Services, Belleville, IL
    Monday, June 25, 2012 8:26 PM
    Moderator
  • Can you switch to sending out via DNS to see if that helps?

    Robert Pearman SBS MVP (2011) | www.titlerequired.com | www.itauthority.co.uk

    Monday, June 25, 2012 8:42 PM
    Moderator
  • I have run the Fix My Network utility on the SBS Console. 2 issues were reported:

    1. Could not configure the Network Router (as I mentioned, I dont think this is an issue. I am the only person who can log into the unit and I have just checked that port 25 is open on the Firewall).

    2. A network component is not configured properly (Component ID 4).

    Upon clicking next, issue 2 seems to be resolved (the KB article copied in for your convenience http://support.microsoft.com/kb/957711

    Component ID #4
    If the Fix My Network wizard shows that component ID #4 is broken, this means that the TSGateway service is not configured to correctly use the SSL certiifcate configured within IIS. Continuing to fix this error within the wizard will configure TSGateway property to use the SSL certificate configured inside of IIS and restart the TSGateway service so it will pick up the correct certificate.

    I have also run the SBS BPA, the only thing that was reported was "The log file for the Windows SharePoint Services configuration is getting large". Interestingly, we do not use Sharepoint so I dont think this is much of an issue?

    Shall I rebot the Server?

    Do you know whether I need to set up any inbound/outbound through port 25 on the Windows Firewall?
    Many thanks and kind regards,
    Bertie.

    p.s. My Exchange Server is senidng me these mails:

    From: Microsoft Exchange
    Sent: 25 June 2012 22:25
    To: Bertie
    Subject: Delivery Delayed: Just seeing if I can send external mail.

    Delivery is delayed to these recipients or distribution lists:

    ....

    Sent by Microsoft Exchange Server 2007 Reporting-MTA: dns; ServerName.Mydomain.local

    Monday, June 25, 2012 9:32 PM
  • Dear Robert,

    Thanks for the pointer, can you outline the steps or send me a link please?

    Many thanks and kind regards,
    Bertie.

    Monday, June 25, 2012 9:34 PM
  • Hi,

    Get-ExchangeServer | fl command should be run under the Exchange Management Shell not Windows PowerShell.

    Since your organization could receive external emails, I think the issue could be related to the configurations on your SBS.

    Please run the following command in the EMS to test the mail flow on your server:

    Test-Mailflow <Your_Exchange_Server_FQDN> -TargetEmailAddress <The_Test_Email_Address> -Verbose

    Just like the figure below:

     

    And post back the result. At the same time, since the email stunk in the queue, you could look into the Queue Viewer to verify the status of the email.

    Note: The Queue Viewer could be found under toolbox in EMC.

    Regards,
    James


    James Xiong

    TechNet Community Support

    Tuesday, June 26, 2012 7:36 AM
    Moderator
  • Hi James,

    Thanks for the help. Its such a long time since I have touched Exchange that I completely forgot to go though the Exchange Management Shell and not the Normal Windows Powershell ISE.

    OK, I have copied in the results of the following commands:

    1. Get-ExchangeServer | fl
    2. Get-SendConnector
    3. Test-Mailflow FQDN -TargetEmailAddress InternalMailAddress -Verbose
    4. Test-Mailflow FQDN -TargetEmailAddress ExternalMailAddress -Verbose (which fails)

    As I have seen most security people change their addresses and firm names, I have done the same. however I am happy to send you the raw unedited information by mail if you need them.

    Also, in the Queue Analyzer, I am seeing the following error:

    Next Hop Domain Delivery Type Status Message Count Next Retry Time Last Error
    gmail.com DnsConnectorDelivery Active 9
    External.com DnsConnectorDelivery Retry 2 26 June 2012 10:11:10 451 4.4.0 Primary target IP address responded with: "421 4.2.1 Unable to connect." Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts.
    Submission Undefined Ready 0  

    Many thanks and kind regards,

    Bertie

    p.s. I am happy to send you the TCP/IP for the 2 SQL Server Instances if you feel that will be of any help as I made changes there on Friday. I do recall making changes, but though I only made changes to the TCP/IP of the new SQL Server 2008 instance and not the SQL2005 SBSMonitoring instance. Just in case its of any help to you, from SQL Server Configuration Manager, if I look at SBSMonitoring, these are the settings for some of the IPAddresses
    (Note that port 1 appears on my powershell Send Connector below):

    ################################################################################
    SQL Server Configuration Manager (SBSMonitoring):
    ################################################################################IP5
    Active                    = Yes
    Enabled                  = No
    IP Address              = ::1
    TCP Dynamic Ports  = 0
    TCP Port                 =

    IP6
    Active                    = Yes
    Enabled                  = No
    IP Address              = 127.0.0.1
    TCP Dynamic Ports  = 0
    TCP Port                 =

    ################################################################################
    Exchange Management Shell:
    ################################################################################
    Notes:
    1. MyDomain replaced with contoso
    2. MyServerName replaced with ServerName
    3. My email address is of the form bertie.surname1-surname2@contosobiz.co.uk

    ################################################################################
    Normally the FQDN is the SMTP Address required. You can get that from the
    following command:
    [PS] C:\Windows\system32>Get-ExchangeServer | fl

    Name                              : ServerName
    DataPath                          : C:\Program Files\Microsoft\Exchange Server\
                                        Mailbox
    Domain                            : contoso.local
    Edition                           : Standard
    ExchangeLegacyDN                  : /o=First Organization/ou=Exchange Administr
                                        ative Group (FYYYYYYYYYYYYLT)/cn=Configurat
                                        ion/cn=Servers/cn=ServerName
    Fqdn                              : ServerName.contoso.local
    IsHubTransportServer              : True
    IsClientAccessServer              : True
    IsExchange2007OrLater             : True
    IsEdgeServer                      : False
    IsMailboxServer                   : True
    IsMemberOfCluster                 : No
    IsProvisionedServer               : False
    IsUnifiedMessagingServer          : False
    NetworkAddress                    : {ncacn_vns_spp:ServerName, netbios:ServerName,
                                        ncacn_np:ServerName, ncacn_spx:ServerName, ncac
                                        n_ip_tcp:ServerName.contoso.local, ncalrpc
                                        :ServerName}
    OrganizationalUnit                : contoso.local/ServerName
    AdminDisplayVersion               : Version 8.3 (Build 83.6)
    Site                              : contoso.local/Configuration/Sites/Defaul
                                        t-First-Site-Name
    ServerRole                        : Mailbox, ClientAccess, HubTransport
    ErrorReportingEnabled             :
    StaticDomainControllers           : {}
    StaticGlobalCatalogs              : {}
    StaticConfigDomainController      :
    StaticExcludedDomainControllers   : {}
    CurrentDomainControllers          : {}
    CurrentGlobalCatalogs             : {}
    CurrentConfigDomainController     :
    ProductID                         : xxxxx-xxx-xxxxxxx-xxxxx
    IsExchange2007TrialEdition        : False
    IsExpiredExchange2007TrialEdition : False
    RemainingTrialPeriod              : 00:00:00
    IsValid                           : True
    OriginatingServer                 : ServerName.contoso.local
    ExchangeVersion                   : 0.1 (8.0.535.0)
    DistinguishedName                 : CN=ServerName,CN=Servers,CN=Exchange Administ
                                        rative Group (FYYYYYYYYYYYYLT),CN=Administr
                                        ative Groups,CN=First Organization,CN=Micro
                                        soft Exchange,CN=Services,CN=Configuration,
                                        DC=contoso,DC=local
    Identity                          : ServerName
    Guid                              : 6aaaaad-7ded-9512-87f8-8bbbbbbbbbb1
    ObjectCategory                    : contoso.local/Configuration/Schema/ms-Ex
                                        ch-Exchange-Server
    ObjectClass                       : {top, server, msExchExchangeServer}
    WhenChanged                       : 12/03/2011 14:02:55
    WhenCreated                       : 17/02/2011 13:03:28


    ################################################################################

    [PS] C:\Windows\system32>Get-SendConnector

    Identity                           AddressSpaces Enabled
    --------                           ------------- -------
    Windows SBS Internet Send ServerName {smtp:*;1}    True


    ################################################################################
    Test-mail
    Test-Mailflow ServerName.contoso.local -TargetEmailAddress Nick@contosobiz.co.uk -Verbose
    Test-Mailflow ServerName.contoso.local -TargetEmailAddress MyGmail@gmail.com -Verbose

    [PS] C:\Windows\system32>Test-Mailflow ServerName.contoso.local -TargetEmailAdd
    ress Nick@contosobiz.co.uk -Verbose
    VERBOSE: Test-Mailflow : Beginning processing.
    VERBOSE: Test-Mailflow : Searching objects "ServerName.contoso.local" of type
    "Server" under the root "$null".
    VERBOSE: Test-Mailflow : Previous operation run on domain controller
    'ServerName.contoso.local'.
    VERBOSE: Test-Mailflow : Searching objects
    "SystemMailbox{6aaaaaa3-f01e-6d14-b480-1dddddddddd0}" of type "ADSystemMailbox"
     under the root "$null".
    VERBOSE: Test-Mailflow : Previous operation run on global catalog server
    'ServerName.contoso.local'.
    VERBOSE: Testing mail flow.

    TestMailflowResult         MessageLatencyTime                      IsRemoteTest
    ------------------         ------------------                      ------------
    Success                    00:00:00.6719193                                True
    VERBOSE: Test-Mailflow : Ending processing.


    [PS] C:\Windows\system32>Test-Mailflow ServerName.contoso.local -TargetEmailAdd
    ress MyGmail@gmail.com -Verbose
    VERBOSE: Test-Mailflow : Beginning processing.
    VERBOSE: Test-Mailflow : Searching objects "ServerName.contoso.local" of type
    "Server" under the root "$null".
    VERBOSE: Test-Mailflow : Previous operation run on domain controller
    'ServerName.contoso.local'.
    VERBOSE: Test-Mailflow : Searching objects
    "SystemMailbox{6aaaaaa3-f01e-6d14-b480-1dddddddddd0}" of type "ADSystemMailbox"
     under the root "$null".
    VERBOSE: Test-Mailflow : Previous operation run on global catalog server
    'ServerName.contoso.local'.
    VERBOSE: Testing mail flow.

    TestMailflowResult         MessageLatencyTime                      IsRemoteTest
    ------------------         ------------------                      ------------
    *FAILURE*                  00:00:00                                        True
    VERBOSE: Test-Mailflow : Ending processing.

     

    Tuesday, June 26, 2012 9:24 AM
  • If it is of any help, I have drilled down further into the Exchange Query Analyzer and have copied in some of the entries below:

    From Address Status Size (KB) SCL Queue ID Message Source Name Subject Last Error
    Bertie@contosobiz.co.uk Ready 17 -1 ServerName\7 Pickup Just seeing if I can send external mail. 
    Admin@contosobiz.co.uk Active 8 0 ServerName\7 Pickup Contoso Server Admin Logoff Notification 
    Admin@contosobiz.co.uk Ready 8 0 ServerName\7 Pickup Contoso Server Admin Logoff Notification 
    Admin@contosobiz.co.uk Ready 8 0 ServerName\7 Pickup Contoso Server Admin Logoff Notification 
    Admin@contosobiz.co.uk Ready 8 0 ServerName\7 Pickup Contoso Server Admin Logon Notification 400 4.4.7 Message delayed
    Admin@contosobiz.co.uk Ready 4 0 ServerName\7 SMTP:Default ServerName Contoso Server Admin Logon Notification 400 4.4.7 Message delayed
    Admin@contosobiz.co.uk Ready 4 0 ServerName\7 SMTP:Default ServerName Contoso Server Admin Logoff Notification 400 4.4.7 Message delayed
    Admin@contosobiz.co.uk Ready 4 0 ServerName\7 SMTP:Default ServerName Contoso Server Admin Logoff Notification 
    MonAcct@contosobiz.co.uk Ready 848 0 ServerName\7 Pickup Detailed Network Report 

    Tuesday, June 26, 2012 10:50 AM
  • Can you send us -

    Get-SendConnector | fl


    Robert Pearman SBS MVP (2011) | www.titlerequired.com | www.itauthority.co.uk

    Tuesday, June 26, 2012 11:05 AM
    Moderator
  • Hi Robert,

    Thanks for chipping in, really appreciate the help. I have renamed the usual parts to Contoso. What I have renamed is in Bold

    [PS] C:\Windows\system32>Get-SendConnector | fl


    AddressSpaces                : {smtp:*;1}
    AuthenticationCredential     :
    Comment                      :
    ConnectedDomains             : {}
    ConnectionInactivityTimeOut  : 00:10:00
    DNSRoutingEnabled            : True
    DomainSecureEnabled          : False
    Enabled                      : True
    ForceHELO                    : False
    Fqdn                         : remote.contosobiz.co.uk
    HomeMTA                      : Microsoft MTA
    HomeMtaServerId              : MyServerName
    Identity                     : Windows SBS Internet Send MyServerName
    IgnoreSTARTTLS               : False
    IsScopedConnector            : False
    IsSmtpConnector              : True
    LinkedReceiveConnector       :
    MaxMessageSize               : 10MB
    Name                         : Windows SBS Internet Send MyServerName
    Port                         : 25
    ProtocolLoggingLevel         : None
    RequireTLS                   : False
    SmartHostAuthMechanism       : None
    SmartHosts                   : {}
    SmartHostsString             :
    SourceIPAddress              : 0.0.0.0
    SourceRoutingGroup           : Exchange Routing Group (DWBBBBBBBBBBJR)
    SourceTransportServers       : {MyServerName}
    UseExternalDNSServersEnabled : False

    Tuesday, June 26, 2012 11:15 AM
  • Ok so this tells me you are using DNS to send out email, can you confirm if your ISP requires a smarthost?

    Robert Pearman SBS MVP (2011) | www.titlerequired.com | www.itauthority.co.uk

    Tuesday, June 26, 2012 11:27 AM
    Moderator
  • Hi Robert,

    Something I overlooked was that our building also had a terrible service outage on Friday and I believe some parts were changed on the Server. As we take our Internet connection though the building (which acts as an ISP to all the occupying offices), I have contected them with your question.

    FYI, I have spoken with my Antivirus provider and my Domain Host provider who has my MX records and both confirm everything on their side and my side relating to their respective services is fine so its something either on my SBS Server or at the Building ISP. I will come back with details.

    Many thanks and kind regards,

    Bertie.

    Tuesday, June 26, 2012 12:30 PM
  • Hi Robert,

    I have confirmed from my building ISP that they do not need  a smart host. On tMicrosoft SQL Server Forum, an MVP there has mentioned the problem could be with my SMTP Connector: http://social.msdn.microsoft.com/Forums/en-US/sqlsetupandupgrade/thread/a6794784-8906-4256-add5-1c5a253f8bf9/

    I would really appreciate if we could explore opnening the port 25 on my Server to allow the traffic out, or reconfiguring the SMTP Connector to a new port temporarily and then setting it back to its original setting as this may help it to renew some aspect of the SMTP configuration?

    Obviously, there is always uninstalling SQL Server 2008R2 Express, but I had to uninstall SQL Server 2005 Common Componenets as this is a pre-requisite for getting SQL Server 2008 R2 installed on SBS2008. I would be loathed to rebuilding the SBS 2008 Server or rolling back as I have never performed these tasks.

    Many thanks and kind regards,

    Bertie.

    Tuesday, June 26, 2012 3:02 PM
  • You dont need to open port 25 on your server to outside, unless you have blocked it at either your router, or in the windows firewall on your server.

    By default SBS should allow all required traffic out of it's own firewall.

    On a client PC can you telnet to an external mail server on port 25? this should show wether the router is allowing smtp traffic out.

    Then next would be to check windows firewall for anything blocking smtp / port 25 outbound.


    Robert Pearman SBS MVP (2011) | www.titlerequired.com | www.itauthority.co.uk

    Tuesday, June 26, 2012 4:01 PM
    Moderator
  • Initial findings from speaking with a Sonicwall consultant is that Port 25 is open on my Gateway device and he *thinks* the sonicwall device is receiving packets from the Server so I guess I need to ensure that the packets are being received by my Sonicwall Firewall applicance with the correct headers and have the correct routing information on the packets in which case, if they are not arriving means there could be a problem with my building's ISP?

    I will be speaking with Sonicwall again tomorrow. If anyone has seen similar issues and would like to address issues I should resolve, then please let me know. I remotely installed telnet on one of the client nodes and I could not establish a connection on port 25. I will update tomorrow with more information. I feel that I am getting closer to resolving so thanks all for the helpful comments. Its been tough!

    Regards,
    Bertie.

     

    Tuesday, June 26, 2012 6:25 PM
  • I have seen similar, one of our clients had port 25 blocked from their IP by their ISP. This may have happened to you... You may still be able to send via port 587. See if you can telnet relay.plus.net 25 or similar and see if you get any response.
    Tuesday, June 26, 2012 9:30 PM
  • Sorry for the delay in coming back to you. But I have had further problems this morning.

    I seem to have lost my DNS Server on the SBS 2008 Server. So I believe my current network does allow some traffic (Skype, Inbound e-mail), but I now can not get access to the internet from inside my network or send outgoing mails.

    From one of the nodes (I only have a handful of clients attached to a Switch along with the Server), I can ping 8.8.8.8 and receive 4 packets. If I try this from the Server, I dont get any respose and it just times out.

    As my SBS 2008 Server is my DNS Server, I am not able to access the internet from my nodes. I have a Sonicwall device and I have checked to ensure the DNS Server 1 and 2 is correct there. Any suggestions? Also, if anyone knows of any help in the Surrey area, I may need to get someone to help out?

    Many thanks and kind regards,

    Bertie.

    Wednesday, June 27, 2012 11:10 AM
  • Restart DNS Server Service.

    Do you use Root Hints, or DNS Forwarders?

    This may be your issue regarding DNS.

    http://blogs.technet.com/b/sbs/archive/2009/01/29/cannot-resolve-names-in-certain-top-level-domains-like-co-uk.aspx

    Happy to help, contact details on my blog :)


    Robert Pearman SBS MVP (2011) | www.titlerequired.com | www.itauthority.co.uk


    Wednesday, June 27, 2012 11:33 AM
    Moderator
  • Hi Robert,
    Thanks for the offer of help. I have tried restarting dns services from services.msc. I am not sure if I use Root Hints or Forwarders.
    Essentially, I have only configured my DNS Server ports on the Sonicwall firewall applicance.

    Just out of interest, I cant see your contact details on www.titlerequired.com but I can see a general 0845 number on www.itauthority.co.uk. Is that the right number to use?

    Many thanks and kind regards,

    Bertie.

    Wednesday, June 27, 2012 11:41 AM
  • That would work yes :)

    Robert Pearman SBS MVP (2011) | www.titlerequired.com | www.itauthority.co.uk

    • Marked as answer by Bertie70 Wednesday, June 27, 2012 3:33 PM
    Wednesday, June 27, 2012 11:42 AM
    Moderator
  • OK,

    With the help of Robert Pearman, we established that the Sonicwall engineer accidently removed my NAT policy which when restored resolved the Internet connectivity problems. Robert was a fantasic help as he conferenced in on a call with the Sonicwall engineer to diagnose the outgoing SMTP mail flow problem as being due to a problem at my ISP gateway.

    Being the eternal pessimist, thinking that I know nothing about IT, I worngly assumed that it was deployment of SQL Server 2008R2 onto SBS 2008 that caused the problem and I think it was the building's network outage where come componentes on the Server have been replaced.

    Robert kindly temporarily patched my network with a Smart-host that we purchased from DynDNS. This will give me some breathing space to get my building ISP to restore my mail flow through port 25! Nice to have emerged from the ground and thanks everyone who chipped in with helpful comments.

    Very impressive "fire-fighting" service from Rob @ http://titlerequired.com/.

    Bertie.

    • Marked as answer by Bertie70 Wednesday, June 27, 2012 3:33 PM
    Wednesday, June 27, 2012 3:32 PM
  • It was interesting following this.  Glad you got it sorted.
    • Marked as answer by Bertie70 Thursday, June 28, 2012 8:04 AM
    • Unmarked as answer by Bertie70 Thursday, June 28, 2012 8:04 AM
    • Marked as answer by Bertie70 Thursday, June 28, 2012 8:04 AM
    • Unmarked as answer by Bertie70 Thursday, June 28, 2012 8:24 AM
    Thursday, June 28, 2012 7:49 AM
  • Thanks, I believe my Network configuration is a bit of a special case situation as we take out line out to the internet from the Building as a package deal all inclusive with our rent. The problem is that they dont really have a dedicated IT Network specialist who can quickly resolve problems so at times, it feels like the blind leading the blind. (I am not prepared to change building yet though as I like my picturesque view out of the bay window).

    I am not sure if it is possible, but it would be great to see the ability to have multiple SendConnectors in SBS (I am not sure if this is currently possible). Rob @ http://titlerequired.com/ kindly reconfigured my Server to use a SmartHost and send mail out on port 2525 through DynDNS. I am hoping that when we track down the problem further upstream as to why port 25 is being blocked through my ISP, from my current understanding we will need to reconfigure SBS to send on port 25.

    Obviously, now that I have purchased an annul subscription to "Dyn Standard SMTP", I would like to have a preference where I route SMTP through my ISP, but if that fails, it then routes to DynDNS. I am not sure if this is possible in any of the SBS products.

    If there is anything further anyone would like to know about the resolution or my set-up, I am quite happy to try and post back.

    Many thanks and kind regards,

    Bertie.

    • Marked as answer by Bertie70 Thursday, June 28, 2012 8:28 AM
    Thursday, June 28, 2012 8:18 AM
  • It is possible to have multiple send connectors, though not sharing an address space as far as i know.

    Smtp Connector #1 - Send Via Dns smtp domains * (all) cost 1

    Will send all email via DNS.

    Smtp Connector #2 - Send Via SmartHost smtp domains @titlerequired.com cost 1

    Smtp Connector #1 - Send Via Dns smtp domains * (all) cost 2

    That configuration would route email to titlerequired.com via smarthost, and any other domain via dns.

    You can have multiple connectors defined, enabled / disabled / different costs etc.

    It might be possible to try to load balance, or have multiple connectors on a cost of 1, however i would suggest it is easier to have one active SMTP Connector, so you have less to troubleshoot.


    Robert Pearman SBS MVP (2011) | www.titlerequired.com | www.itauthority.co.uk

    • Marked as answer by Bertie70 Thursday, June 28, 2012 8:28 AM
    Thursday, June 28, 2012 8:23 AM
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