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Hello everyone,
I've read some posts concerning this but I'm not sure if I understood correctly.
My plan is to create a subdomain (e.g. mail.somedomain.com) wich get's a let's encrypt cert trough cloudflare dns (this works). And only on this domain I'd like to be ports 993/465 (IMAPS/SMTPS) reachable. Those should be forwarded trough HAproxy to an internal server.
The internal server (mailcow) has a self signed ceritifcate.

I've created the real server, backend pool, virtual server and some extra rules & conditions i've read about online.

Configuration:

Code Select Expand

# Frontend: 0_MAILCOW_frontend_imaps
frontend 0_MAILCOW_frontend_imaps
    bind 0.0.0.0:993 name 0.0.0.0:993 ssl no-tls-tickets ssl-min-ver TLSv1.2 ciphers ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES256-GCM-SHA384 ciphersuites TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256 alpn h2,http/1.1 crt-list /tmp/haproxy/ssl/XX.certlist
    mode tcp

    # logging options
    # ACL: traffic_ssl
    acl acl_687b7007ab7f94.09967451 req_ssl_hello_type 1
    # ACL: mail_Subdomain_Check
    acl acl_6877ab1b8aa420.23960963 req.ssl_sni -i mail.somedomain.com

    # ACTION: request_inspect_delay
    # NOTE: actions with no ACLs/conditions will always match
    tcp-request inspect-delay 5s
    # ACTION: request_content_accept_ssl
    tcp-request content accept if acl_687b7007ab7f94.09967451
    # ACTION: mailserver_sni
    use_backend MAILCOW_backend_imaps if acl_6877ab1b8aa420.23960963


    # Backend: MAILCOW_backend_imaps ()
backend MAILCOW_backend_imaps
    # health checking is DISABLED
    mode tcp
    balance source
    # stickiness
    stick-table type ip size 50k expire 30m 
    stick on src
    server MAILCOW_server_IMAPS INTERNAL_IP:993 ssl alpn h2,http/1.1 verify none send-proxy-v2 check-send-proxy

I'm getting a connect with openssl s_client -connect, but on ALL Subdomains / IPs and no IMAP "Hello". Can't see any informational messages in HAproxys logfile (?).

Thank you very much.