I have an odd problem with a new Windows 2008 terminal server I have set up.
Every request it passes to our TMG 2010 proxy results in an error on the TMG box (details of this error at the end).
The terminal server in question is set up as a VM on XenServer and is replacing a 2003 server that was there before (ie. the virtual drive has been formatted and 2008 installed).
Anyone got any ideas why this is? I can access internal intranet sites, so those web servers are obviously receiving correctly formed packets, and I can RDP into the machine, etc...
It seems to think that the packets are malformed - ie. they don't pass TCP checksum tests on the TMG box.
Originally Posted by TMG
Ok, after putting just the result code into Google, and nothing else, I discovered that this issue is a known bug when using TMG in some virtual environments and relates to checksum offloading.
To fix it, I disabled the various checksum offloads in the device settings for the network card on the TMG box and all is now well.
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