Hi Guys,

I have three identical Nextcloud servers in operation. A haproxy takes
the round robin. In principle everything works, but only almost.

When im surfing the proxy, im reaching one of the server. However, the
login does not work. I surf the individual server directly, everything
works flawlessly.

I have noticed that when I log on to the proxy and try to log in, it
takes a moment and then I redirected to other nextcloud instance. The
url chances from:

http://SERVER/index.php/login
<http://server/index.php/login> --> 
http://SERVER/index.php/login?redirect_url=/index.php/apps/files/
<http://server/index.php/login?redirect_url=/index.php/apps/files/>

Config:

#####################START#####################

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
        maxconn 4096
        tune.ssl.default-dh-param 2048
        # Default SSL material locations
        ca-base /etc/ssl/certs
        crt-base /etc/ssl/private

        # Default ciphers to use on SSL-enabled listening sockets.
        # For more information, see ciphers(1SSL). This list is from:
        #  https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
        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 forwardfor
        option http-server-close
        option  httplog
        option  dontlognull
        stats enable
        stats uri /stats
        stats realm Haproxy\ Statistics
        stats auth user:password!
        timeout connect 5000
        timeout client  50000
        timeout server  50000
        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 www-http
   bind SERVERROXY:80
   reqadd X-Forwarded-Proto:\ http
   default_backend www-backend

frontend www-https
   bind SERVERROXY:443 ssl crt /etc/ssl/private/SERVER.pem
   reqadd X-Forwarded-Proto:\ https
   default_backend www-backend

backend www-backend
   balance roundrobin
   redirect scheme https if !{ ssl_fc }
   server nxtcl1 SERVER:80 check
   server nxtcl2 SERVER:80 check
   server nxtcl3 SERVER:80 check

#####################END#####################

I guess i have to do some header or cookie manipulation. But im really
helpless at this time. I hope you can help me!

Best regards!

Micha

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