Nginx reverse proxy to Exchange 2010/2013

nginx.conf

server {
        listen 80;
        #listen [::]:80;
        server_name mail.gwtest.us autodiscover.gwtest.us;
        return 301 https://$host$request_uri;
}

server {
        listen 443;
        #listen [::]:443 ipv6only=on;
        ssl                     on;
        ssl_certificate         /etc/ssl/nginx/mail.gwtest.us.crt;
        ssl_certificate_key     /etc/ssl/nginx/mail.gwtest.us.open.key;
        ssl_session_timeout     5m;

        server_name mail.gwtest.us;

        location / {
                return 301 https://mail.gwtest.us/owa;
        }

        proxy_read_timeout      360;
        proxy_pass_header       Date;
        proxy_pass_header       Server;
        #proxy_pass_header      Authorization;

        proxy_set_header        Host $host;
        proxy_set_header        X-Real-IP $remote_addr;
        proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;

        location ~* ^/owa { proxy_pass https://exch1.test.local; }
        location ~* ^/Microsoft-Server-ActiveSync { proxy_pass https://exch1.test.local; }
        location ~* ^/ecp { proxy_pass https://exch1.test.local; }
        location ~* ^/rpc { proxy_pass https://exch1.test.local; }
        #location ~* ^/mailarchiver { proxy_pass https://mailarchiver.local; }

        error_log /var/log/nginx/owa-ssl-error.log;
        access_log /var/log/nginx/owa-ssl-access.log;
}
    

Have you tested your site with https://www.ssllabs.com/ssltest/?

@MakoWish

This is my nGinx config;

this is my current config... works great with ActiveSync and OWA but NOT with RPC/MAPI over HTTPS

_add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload";

location / {
proxy_pass http://192.168.1.4/;
proxy_ssl_name $host;
proxy_ssl_server_name on;
proxy_pass_request_headers on;
proxy_pass_header Date;
proxy_pass_header Server;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-Host $host:$server_port;
proxy_set_header Host $host;
more_set_input_headers 'Authorization: $http_authorization';
proxy_buffer_size 128k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;
proxy_read_timeout 3600;

}_

Do not use nginx for Exchange, it's not work correctly, better use haproxy

frontend ft_https
                bind *:443 ssl crt /etc/haproxy/emailcert.pem
                reqadd X-Forwarded-Proto:\ https
                default_backend bk_exchange

                acl ft_owa      hdr(host) -i email.example.com
                use_backend bk_exchange if ft_owa

backend bk_exchange
                acl path_root url_len 1
                acl path_exchange path_beg -i /autodiscover /owa /oab /ews /public /microsoft-server-activesync /rpc /mapi /favicon.ico
                http-request deny unless path_exchange OR path_root
                server exchange 10.0.25.25:443 check ssl verify none

Thank you, this works extremely well, Outlook connects without any issues.
I've added some default values taken from the web, but the rest is basically untouched:

defaults
    mode http

    retries                   3 # Try to connect up to 3 times in case of failure
    timeout connect           5s # 5 seconds max to connect or to stay in queue
    timeout http-keep-alive   1s # 1 second max for the client to post next request
    timeout http-request      15s # 15 seconds max for the client to send a request
    timeout queue             30s # 30 seconds max queued on load balancer
    timeout client            30m
    timeout server            30m

frontend ft_https
    bind *:443 ssl crt /etc/haproxy/server.pem
    http-request add-header X-Forwarded-Proto https
    default_backend bk_exchange

    acl ft_owa      hdr(host) -i email.example.com
    use_backend bk_exchange if ft_owa

backend bk_exchange
    acl path_root url_len 1
    acl path_exchange path_beg -i /autodiscover /owa /oab /ews /public /microsoft-server-activesync /rpc /mapi /favicon.ico
    http-request deny unless path_exchange OR path_root
    server exchange 10.1.1.1:443 check ssl verify none

I'm using docker-compose, so here's the docker-compose.yml:

version: "2"
services:
    haproxy-exch-reverse-proxy:
        image: haproxy:alpine
        container_name: haproxy-exch-reverse-proxy
        volumes:
        - ./outlook-haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg
        - ./server.pem:/etc/haproxy/server.pem
        ports:
        - 443:443
        restart: unless-stopped