> Often, when I see the 502 errors in our squid 3.3.9 access.log, the problem is in > our company firewall. Firewall blocks packets from origin server, squid is not > able to receive them and writes 502 errors to access.log. > > Try to check your firewall logs. HTH. > > -- > Peter Benko Hi Peter, Yes, I have already looked into this and believe I can rule it out. I have also looked at our iptable rules on the squid proxy too but still no luck. Cheers, John.