We use the new SCR replication to our Remote Backup location. For some reason emails started to queue up. I rebooted the Mailstore in hopes the hub would then be able to deliver the messages, this didn’t help, when Exchange mailstore came back up, the IS and SA wouldn’t start, here are some of the event log errors:
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Event Type: Error
Event Source: MSExchange ADAccess
Event Category: Topology
Event ID: 2142
Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=1528). Topology discovery failed, error 0x8007077f.
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Event Type: Error
Event Source: MSExchangeIS
Event Category: General
Event ID: 5000
Unable to initialize the Microsoft Exchange Information Store service. - Error 0xfaf.
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Event Type: Error
Event Source: MSExchangeTransportLogSearch
Event Category: General
Event ID: 7005
Microsoft Exchange couldn't read the configuration from the Active Directory directory service because of error: Failed to load config due to exception: Microsoft.Exchange.Data.Directory.NoSuitableServerFoundException: The Exchange Topology service on server localhost did not return a suitable domain controller………
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All of this told me that exchange was unable to locate a GC in it’s site. That’s pretty odd, there is a DC/GC racked right above it on the same lan. However, after quite a bit of trial and error I noticed that in AD Sites there was no “Subnet” for this range of IP addresses, someone had deleted it. Once this was fixed and I forced a full AD Sync, everything came back online.
NOTE: another thing I did was to change the DNS settings for the Exchange Mailstore. I read that sometimes you have problems locating a GC if you point to a DNS/DC server that is far away and not in your site. I doubt this did much, but its working now so I thought i’d throw it in there.
