We are using Exchange 2003 SP2. We are using RPC over HTTP for internal mail as well as using it for external access.
The event in question is below:
The description for Event ID ( 8355 ) in Source ( MSExchangeAL ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: DC.domain.com, .
I first thought the issue was related to a different issue we had, which was where EVERY Exchange based Event was in the same format as the above. That just turned out to be some missing DLL files. But when I fixed that problem, this ONE stayed this way. I then noticed that it was happening every 30 minutes, and always included our Domain Controller FQDN at the end of the event. That DC has all the FSMO roles, and is our Primary DNS server as well.
The catagory of the above Event is LDAP operations, and I don't really know where to go with this. Maybe its nothing, but an event that Exchange doesn't recognize throws up red flags in my opinion. Thanks!