I am currently having trouble with our domain. The clients (most of them anyway) are taking an age to log on (15 minutes in some cases!)
I have ran netdiag and everything seems fine via that, but dcdiag turns up with
Starting test: systemlog
An Error Event occurred. Event ID: 0x00000457
Time Generated: XX/XX/XXXX XX:XX:XX
(Event String could not be retrieved)
with the message repeated 4 times.
Everything else passes fine.
I have 3 DC's - 2 set as Global catalogs.
There aren't any errors in any logs. The DNS servers seem to be working fine.