I am testing TPROXY with Squid v3.1.14 on CentOS v6 and noticed several TCP-performance related problems were squid is failing due to TCP session handling issues. CentOS v6 is running a 2.6.32-71.29.1 kernel, and I saw a TPROXY listserv posting from Nov 10, 2010 about TPROXY/Kernel hanging issues and a fix that was merged in and after 2.6.37. My question is if this issue could be the root cause of the problems I am seeing, and if anyone had suggestions for further debugging and solutions. Squid is reporting a higher than normal number of 502 BAD GATEWAY errors and some websites consistently not working. I have testing the squid install without TPROXY and the errors go away, so I know it is TPROXY related. If upgrading the kernel is the way to go, that gets hairy with CentOS and I am not sure which method is the best way to go for upgrading the kernel. Any thoughts or suggestions? Nicholas