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Exchange 2010 - 2003 no mail flow RRS feed

  • Question

  • So I have a brand new Exchange 2010 box stood up. Old box is SBS2003 which is still live until I start the migration.....which is why I am testing.

    Exchange 2010 can send/receive external email. Exchange 2003 can send to 2010. 2010 cannot send to 2003. Messages just get stuck in the queue with error "451 4.4.0 DNS query failed. The error was SMTPSEND.DNS.NonExistentDomain; nonexistent domain"

    There is a new domain controller (2008R2 global catalog). I had DNS on Exchange 2010 pointed to new DC. External send/receive email would not work. Pointed Exchange 2010 DNS to 2003 DC and external mail now flows. Changed DNS on Exchange 2010 back to 2008R2 DC and external mail still flows.....weird.

    Exchange BPA checks out fine. DNS records are in place for all servers on both DCs. On Exchange 2010 in send connectors I see the Small Business SMTP connector, it is enabled, address space *, and set to use DNS lookups. On the 2003 server there is the FYDIB..... Exchange routing group. All server are in the default AD site. All servers are on same subnet.

    Anyone got any ideas on what's going on? Thanks!
    Tuesday, November 15, 2011 7:41 PM

Answers

  • I ended up opening a call with Microsoft. It seems that the problem magically resolved itself at some point during the case. Neither I nor Microsoft know exactly why it started working again.
    • Proposed as answer by Sukh828 Thursday, December 1, 2011 8:06 PM
    • Marked as answer by Rowen-Xu Friday, December 2, 2011 1:14 AM
    Thursday, December 1, 2011 8:01 PM

All replies

  • So test emails that were sitting in the queue magically went through at 5:10p yesterday. Look in the event viewer at that time and see:

    Event ID 2080

    Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=1392). Exchange Active Directory Provider has discovered the following servers with the following characteristics:

    (Server name | Roles | Enabled | Reachability | Synchronized | GC capable | PDC | SACL right | Critical Data | Netlogon | OS Version)

    In-site:

    Exch2003.domain.local CDG 1 7 7 1 0 1 1 7 1

    New2008DC.domain.local CDG 1 7 7 1 0 1 1 7 1

    Out-of-site:

     

    Test emails are still not currently working from 2010 to 2003, they just sit in the queue - but anything in the queue went through when the above event ID processed.

    Tuesday, November 15, 2011 8:06 PM
  • Have you made sure that your RGC is bidirectional?

    If not, take a look at http://technet.microsoft.com/en-us/library/aa997292.aspx

     

    Wednesday, November 16, 2011 2:43 AM
  • Hi,

    It seems like a DNS issue.

    Please add the IP address and NetBIOS / FQDN for E2K3 in host file on E2K10.

    Please check whether there's fault DNS server configuration on Exchange Server network card.

    Thanks.


    Best Regards!

    • Edited by Rowen-Xu Wednesday, November 16, 2011 3:14 AM
    Wednesday, November 16, 2011 3:13 AM
  • Kaiser - yes, I have run that exact command.

     

    Rowen - Agreed, I do think this is a DNS issue of some kind. I'm not a big fan of messing with hosts file as it is just a band aid for broken DNS. I did not see fault DNS server configuration option anywhere on the config of the NIC.

    Wednesday, November 16, 2011 10:15 PM
  • Hi,

    Please just give it a shot.

    Add the IP address and NetBIOS / FQDN for E2K3 in host file on E2K10.

    If it doesn't work you can remove it.

    Thanks.


    Best Regards!
    Thursday, November 17, 2011 7:24 AM
  • Hi,

    Any update?


    Best Regards!
    Saturday, November 26, 2011 2:46 AM
  • I ended up opening a call with Microsoft. It seems that the problem magically resolved itself at some point during the case. Neither I nor Microsoft know exactly why it started working again.
    • Proposed as answer by Sukh828 Thursday, December 1, 2011 8:06 PM
    • Marked as answer by Rowen-Xu Friday, December 2, 2011 1:14 AM
    Thursday, December 1, 2011 8:01 PM