I ran into an interesting situation today. After applying Windows Server 2003 SP2, the agents on the network would not connect to the KServer even though they could access the internet.

The problem was related to Receive Side Scaling on the NIC, which is automatically enabled by the service pack. After disabling RSS, the agents were able to check in.

Legacy Forum Name: Windows Server 2003 SP2,
Legacy Posted By Username: grega