"The LDAP Server is unavailable" RRS feed

  • Question

  • i've seen some funky behavior in my environment with users connecting to my lync 2010 server. so i went to playing around with something innocuous like forcing a GAL sync.

    PS > Update-CsAddressBook
    Update-CsAddressBook : Message-"The LDAP server is unavailable." LdapError-"ServerDown" "DC-01.contoso.com":"3268"

    This particular DC (DC-01.contoso.com) was added a while ago to our list of DC's. We have (5) i think. This specific DC was causing issues with a new VPN technology we implemented. So we brought this DC down temporarily indefinitely.

    what is the reason that this command (logged into Lync Front End) would throw this error? All related cmdlets throw the same error (Get-CsManagementStoreReplicationStatus, Get-CsAdDomain, etc). Is there a way to change what LDAP server to point to for queries?

    All IP settings are correct. DNS points to correct DNS Server, DNS cache has been cleared.

    If the box doesn't fit, think out of it.

    Monday, February 16, 2015 7:47 PM


  • Lync uses the available Domain Controller and if the DC is down, It should automatically switch to another. I ran in to similar issue and i had to reboot the Lync server to get this fixed. 

    Best Regards, Jit

    • Edited by Jitreddy[Arkadin] Monday, February 16, 2015 10:23 PM
    • Proposed as answer by Eason Huang Thursday, February 19, 2015 1:54 PM
    • Marked as answer by Eason Huang Thursday, February 26, 2015 1:34 AM
    Monday, February 16, 2015 10:21 PM