503 Service Unavailable | The plain HTTP request was sent to HTTPS port

@albanosdes wrote:

Hello there. I’m in need of a reverse proxy, using only HTTPS.

I have my VM-HaProxy on 192.168.10.5
and my VM-Git with a web interface (Gogs), with NGINX listening to 443 with let’s encrypt crt which has been validated.

I’m only using HTTPS, always rewriting http to https.

The thing is, i’m getting a 400 error (The plain HTTP request was sent to HTTPS port) with the backend line :
server vm-git 192.168.10.11:443 weight 1 maxconn 8192
And a 503 Service Unavailable with the backend line :
server vm-git 192.168.10.11:443 weight 1 maxconn 8192 check ssl verify none

I went to a lot of forums searching for a solution, but found none.

My Iptables rules are OK :
#HTTP, HTTPS
iptables -t filter -A OUTPUT -p tcp --dport 80 -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -t filter -A OUTPUT -p tcp --dport 443 -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 443 -j ACCEPT

Debian 8.9 64bits
HA-Proxy version 1.5.8 2014/10/31

---

haproxy.cfg :

global
log /dev/log local0
log /dev/log local1 notice
chroot /var/lib/haproxy
stats socket /run/haproxy/admin.sock mode 660 level admin
stats timeout 30s
user haproxy
group haproxy
daemon

    # Default SSL material locations
    # ca-base /etc/ssl/certs
    # crt-base /etc/ssl/private

    ssl-default-bind-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS
    ssl-default-bind-options no-sslv3

defaults
log global
mode http
option httplog
option dontlognull
timeout connect 5000
timeout client 50000
timeout server 50000
option forwardfor except 127.0.0.0/8
errorfile 400 /etc/haproxy/errors/400.http
errorfile 403 /etc/haproxy/errors/403.http
errorfile 408 /etc/haproxy/errors/408.http
errorfile 500 /etc/haproxy/errors/500.http
errorfile 502 /etc/haproxy/errors/502.http
errorfile 503 /etc/haproxy/errors/503.http
errorfile 504 /etc/haproxy/errors/504.http

############################################

frontend https-in
bind 192.168.10.5:443 ssl crt /etc/haproxy/cert/gogs.pem
acl gogs hdr(host) gogs.imperial-legion.fr
use_backend backendgogs if gogs
default_backend backendgogs

############################################

backend backendgogs
option httpchk
http-request add-header X-Forwarded-Proto https if { ssl_fc }
server vm-git 192.168.10.11:443 weight 1 maxconn 8192
#server vm-git 192.168.10.11:443 weight 1 maxconn 8192 check ssl verify none

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