I have a client with a SBS2011 server, that has been working fine for about 5 months. Recently we have found multiple errors in the application log indicating that the exchange cannot communicate correctly with the DC.
Event ID 2102 - process MAD.exe. All domain controllers are not responding
Event ID: 2102 - process STORE.exe. All domain controllers are not responding.
Event ID: 2102 - process MSEXCHANGEADTOPOLOGYSERVICE.EXE. All domain controllers are not responding.
Event ID: 2080 - process MAD\STORE Exchange active directory provider has discovered the following servers sbs-srv.domain.local CDG 100100000
Event ID: 2114 - process MAD\STORE. Topology discover failed error 0x80040a02 DSC_E_NO_ SUITABLE_CDC
Nothing changed on the server before these errors occurred. The exchange seems to be working fine, but the backup of the database now fails.
I have checked and the exchange server & exchange enterprise server are in the correct group for permissions.
I have added the computer account to the domain admin
IPv6 is enabled
DCDIAG shows no errors
I have rerun setup.com /preparedomain from exchange.
Please does anyone have any other ideas as to what I can check next?