Lookups fail intermittently

[miiike]

I have lookups that seem to fail intermittently. It occurs randomly, can happen once a week for a month, and then not happen again for 3 months, then every other week.

The lookup still works, it returns the users PIN, Email, and partial address. It does not show company name, any phone numbers etc.

A restart of the BES fixes the issue.

I'm running BES 5.0 and up to MR3. SP1 hasn't been installed yet.

DC/GC's are Server 2003 R2, mail system is Exchange 2003 SP2.

Any ideas where to start looking?

[NinjaRAT]

Where's your GC's located in relationship to your Exchange server? Any event logs on the Exchange box indicating query failures to AD?

[miiike]

2 of my GC/DC's are in the same site as Exchange and BES, 2 others are at remote locations.

No errors on the Exchange server regarding AD.