I've inherited an Exchange server that is shutting down at random times during the day. The event log shows a MSExchangeAL error, Event ID: 8026. "LDAP Bind was unsuccessful on directory w2003srvr1.local.wavetec.n
et for distiguished name ". Directory returned error:[0x51] Server Down. (This error toggles between both DCs w2003srvr1 and w2003srvr2)
This error happens about 10 times a SECOND, for between 10 to 30 minutes and then it spontaneously resolves itself. While this is happening, I can still ping the mail server; I can still ping the DC's from the mail server.
I have checked the RUS and FSMO roles. All looks correct, but I can elaborate if necessary.