Hi,
I need a help with an old version of my Oracle Linux Server.
I have an Oracle Linux, working as a Http WebServer, but in some cases the client got a timeout in the http request.
After long nights analyzing the tcpdump we found some ACK challenges being blocked by our firewall.
A lot of googles laters, we found a configuration of net.ipv4.tcp_challenge_ack_limit, what I wondered be the best answer to all my problems. But unfortunately didn't work, we changed this conf to 9999999 and 0, but in both cases the server still sends the challenge ack.
I suspect it's because of the version of my Oracle Linux: OracleLinux 6.9 with an old Kernel : 2.6.32-696.13.2.el6.x86_64.
I know it's an obvius solution, upgrade the OS or change the configuration of the firewall, but it's something I can't do in a short period, because we need to homologate all our software in this new enviroment, what will expend a lot of time.
Someone could, for god, give me some alternative to make this version of Oracle Linux stop to send this ack challenge?