Hi! Thanks for your reply!
We finally found out that the directive in our haproxy.conf tcp-request inspect-delay 30s made this error happened. I think this because the global settings in our defualts: timeout client 60s ------------------------------- But the tcp-request inspect-delay 30s in our frontend didn't cover the timeout. the documentation says: http://cbonte.github.io/haproxy-dconv/configuration-1.5.html#tcp-request inspect-delay >Note that the client timeout must cover at >least the inspection delay, otherwise it will expire first After we change the tcp-request inspect-delay 30s to tcp-request inspect-delay 60s,it works like a charm!

