Trying to forward HTTPS from 443 to 1433 in TCP mode

Hello!

I have two servers (192.168.0.101/2) running two web servers (via containers), one of them listening on port 443 and the other on 1443.

I set up HAproxy on TCP mode and each web server is serving its own certificates.

Postman → https://a.domain.com/ → HAPROXY:443 → SRV1/2:443 works

Postman → https://b.domain.com/ → HAPROXY:443 → SRV1/2:1443 doesn’t work, and Postman gives me a “Client network socket disconnected before secure TLS connection was established”.

If I change the port from 1433 to 443 (and stopping the other container), it works without an issue.

Here’s my config file:

global
    log         127.0.0.1 local2

    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    user        haproxy
    group       haproxy
    daemon

    stats socket /var/lib/haproxy/stats

    ssl-default-bind-ciphers PROFILE=SYSTEM
    ssl-default-server-ciphers PROFILE=SYSTEM

defaults
    log                     global
    option                  httplog
    option                  dontlognull
    option                  http-server-close
    option                  redispatch
    retries                 3
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout http-keep-alive 10s
    timeout check           10s
    maxconn                 3000

frontend https
    mode                    tcp
    option                  tcplog
    bind                    192.168.0.100:443

    tcp-request             inspect-delay 3s
    tcp-request             content accept if { req_ssl_hello_type 1 }

    acl                     SRV_A req.ssl_sni -i a.domain.com
    acl                     SRV_B req.ssl_sni -i b.domain.com

    use_backend             A_HTTPS if SRV_A
    use_backend             B_HTTPS if SRV_B

backend A_HTTPS
    mode                    tcp
    balance                 source
    timeout tunnel          600s
    stick-table             type ip  size 1m  expire 15m
    stick                   on src

    server                  SRV01.domain.com 192.168.0.101:443 check inter 1s fall 1 rise 2
    server                  SRV02.domain.com 192.168.0.102:443 check inter 1s fall 1 rise 2
    
backend B_HTTPS
    mode                    tcp
    balance                 source
    timeout tunnel          600s
    stick-table             type ip  size 1m  expire 15m
    stick                   on src

    server                  SRV01.domain.com 192.168.0.101:1443 check inter 1s fall 1 rise 2
    server                  SRV02.domain.com 192.168.0.102:1443 check inter 1s fall 1 rise 2

Any idea what could be the issue?

Thanks a lot!

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