We have a 2008 R2 server SP2 (recently installed), 3 nics and TMG 2010 on it. TMG just publishes the 443 port on one nic, in order to let TS Gateway takes control to redirects to internal servers. However TS sesions throught TS gateway to diferent 2003 servers are perceptible slow. Even remote sessions directly to 2008 R2 are slow. Certificate is installed and there are no errors besides the 36888 Schannel Error "The following fatal alert was generated: 10. The internal error state is 1203" which seems to be a irrelevant error.
RPCPING test using "Rpcping -v 2 -e 3388 -t ncacn_http -s localhost -o RpcProxy=TS-Gateway -P "username,domain,*" -I "username,domain,*" -H NTLM -u NTLM -a connect -F ssl -B msstd:TS-Gateway" from diferent Windows 7 machines result in "Completed 1 calls in 8281 ms 0 T/S or 8281.000 ms/T". althougtn ping responses in 200 ms.
No antivirus installed on TS Gateway and ForeFront on desktops machines, but same results with ForeFront disabled.
We have tried disable autotuning via netsh in Windows 7 Pc´s and disabling RSS, and Offload in nic advance configurations but without results.
I will apreciate any help, we have dedicated a great effort and no relevant information found.