|Component:||Microsoft Exchange Directory Access Service|
|Message:||Process <process name> (PID=<process id>). All the DS Servers in domain are not responding.|
This error indicates that the Exchange server was unable to contact a domain server in the local domain. DSAccess needs an in-domain domain controller to perform topology discovery. If no domain controllers respond at startup, this is a fatal error, as the System Attendant (Mad.exe) will not start. If this occurs after startup, this is not fatal, unless for some reason ALL domain controllers and global catalogs go down (in which case topology discovery would become necessary).
This event can occur if the domain controller or domain controllers in question become unreachable because of a network problem.
Check all the domain controllers in the same domain as the Exchange server and make sure that at least one of them is up and running and reachable from the Exchange server.