Forefront TMG Client Connection Failes with Checksum Error
Posted on 2011-03-25
I have a forefront tmg server (dual nic, edge/gateway config). The TMG server is a member of the domain (single domain environment). The TMG Client on one of the member servers, a Windows 2008 R2 64bit system, cannot connect to the TMG server.
I am opening the client configuration, and selecting "Manually specified Forefront TMG:" on the "Settings" tab and entering the server name or IP address (tried both) and clicking the "Test Server" button. The error returned is "Failed to connect to server".
Each time I attempt the connection, the TMG server log shows a DENIED CONNECTION with the following information:
Log type: Firewall service
Status: A packet was dropped because verification of its TCP checksum failed.
Rule: None - see Result Code
Source: Internal (10.180.232.213:49342)
Destination: Local Host (10.180.232.214:1745)
Protocol: Forefront TMG Client (TCP)
Number of bytes sent: 0 Number of bytes received: 0
Processing time: 0ms Original Client IP: 10.180.232.213
I can ping the TMG server by name and ip address from the client and I can ping the client by name and ip address from the tmg server.
Any and all ideas are very welcome. I hope you can help me.