I have Windows 2003 server running Exchange 2003 SP2. For the past 1 week, my users cannot connect to the exchange server every morning between 8 -9 am. I have checked on the server but found out no errors on the Exchange Server. Under Eventviewer, found out these event errors such as 8026 / 8250 / 2104 / 2102. I have applied all latest MS updates & checked that all related services are running. My daily backup starts at 10pm at night & shouldn’t affect the connection. The connection is okay when I restart my server.