In the windows application events, it shows many warning messages as the below. What happens for this warining? How to avoid it? Thanks

Event Type:    Warning
Event Source:    WebsenseLogServer
Event Category:    None
Event ID:    4096
Date:        2009-9-03
Time:        09:01:43
User:        N/A
Computer:    WEBSENSE
Description:
0x1568000: LogServer failed 100 times while obtaining group membership from the UserService.