We have 5 offices connected to our main office via varying speed T1’s. Each office has its own Domain and Exchange server. I have setup two way trusts with all domains. We use the lines for Internet and Exchange. This morning two of the remote domains started experiencing problems logging into Proxy. The log files on the proxy server show no domain controller available to validate logon. So I Ping the DC’s of the two domains, that works. I ping the NetBIOS name of the DC’s, that works. I verify that I have WINS working and that the DC shows in the cache. When I pull up the Trust Relationship box it says unable to find DC. I can connect to that domain and transfer files and verify backups worked etc. just cant get Inet access working. They can however connect using an account from another domain. I have event ID’s of 5719, 537, and 100. I can’t find anything conclusive.
Servers are NT4.0 SP6a, Proxy 2.0 SP1, IIS4.0, Exchange 5.5 SP4
