I have problem with Exchanger Server now, the information store service won't start. Here is the network setup:
DC1: host 4 FSMO roles: Domain Naming, RID, PDC, and Infrastructure. It has Win 2008 installed.
DC2: host 1 FSMO role: Schema. It is also a DNS and DHCP. It has Win 2003 R2 SP2
Exchange: it is a DC, DNS, and exchange server. It has Win 2008 R2 and Exchange 2007 standard.
Last night, I added RAM to DC2 and rebooted it. After that, I couldn't receive any emails. This morning the Exchange server has message on screen that the server should be restarted due to some changes made, although I didn't make any change to the Exchanger. I rebooted the Exchange server and the Exchange Information store service couldn't start, neither Exchange Service host nor Exchange Service Attendant services.
I did run a DCDiag /test:replications on Exchange and returns Kerberos Error: A KDC was not fould to authenticate the call. Check that sufficient domain controllers are available. I ran DCDiag /fix and it didn't fix the problem.
There are warnings wiht event ID 1308 and 2088 under Directory Services log on Exchange server. There is also an error with event ID 2087 under System log on Exchange.
All the servers can ping each other using IP addresses and names.