This one has me stumped - I'm trying to proxy SMTP connections however I'm getting an HTTP response when I try to connect to port 25 (even though I've done mode tcp).
This is the smallest subset that reproduced the problem - I can make this work by doing "mode tcp" in the default section and then doing "mode http" in all of the http frontends (not shown). But doing 'mode http' as default and then 'mode tcp' in the smtp frontend definition seems to not work and I'm not certain why. global daemon maxconn 10240 log 127.0.0.1 local0 log 127.0.0.1 local1 notice stats socket /var/run/haproxy.sock user root group root mode 600 level admin stats timeout 2m defaults log global mode http timeout client 30s timeout server 30s timeout connect 4s option socket-stats frontend mainfrontend bind *:25 mode tcp maxconn 10240 option smtpchk EHLO example.com default_backend mxpool backend mxpool balance roundrobin server mailparser-xxx 172.0.0.51:25 check port 25 weight 20 maxconn 10240 server mailparser-yyy 172.0.0.67:25 check port 25 weight 20 maxconn 10240
