GC suddenly stopped responding on Exchange server

[neonetman]

at about 10 minutes to 2 this afternoon our Exchange 2010 server stopped sending emails (they startin queuing with a supposed DNS resolution failure). About the same time, our event log started getting flooded with errors about Active Directory not responding and the GC not listening.

 

Even after a reboot taking 3/4 hour we are still just getting a sea of red in the event logs.

 

Nothing had changed on the server, and the Exchange server is on server which is also the FSMO and DC (it is a separate domain purely for Exchange)

 

 

 

Has anyone come across anything similar to this, and if so what was the cause/resolution?

[psydii]

Never seen that, but also I've never run Exchange on a DC. But a first step would be to see what DCDIAG reports.

 

A guess would be that perhaps the TCPIP settings are pointing at the wrong DNS server (it should be the DNS server integrated with AD for that domain, most likely in this case 127.0.0.1)