# Port is lost when running Mautic behind proxy

**URL:** <https://forum.mautic.org/t/port-is-lost-when-running-mautic-behind-proxy/16350>\
**Category:** Product Support\
**Created:** [September 30, 2020, 8:50am UTC](https://forum.mautic.org/t/port-is-lost-when-running-mautic-behind-proxy/16350 "2020-09-30T08:50:32Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![tpapaj](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/tpapaj/32/3198_2.png) [@tpapaj](https://forum.mautic.org/u/tpapaj)\
**Post date:** [September 30, 2020, 8:50am UTC](https://forum.mautic.org/t/port-is-lost-when-running-mautic-behind-proxy/16350/1 "2020-09-30T08:50:32Z")

</div>

**Your software**  
My Mautic version is: 3.1.0  
My PHP version is: 7.3.22

**Your problem**  
I have problems with getting weird results when Mautic is behind Nginx proxy. I have Mautic running on Docker with on Nginx, container port 5000 is mapped to port 8100(localhost) and I want to proxy it to port 8877(also localhost for tests). The problem is that for some reason Mautic does redirect from localhost:8877 to localhost/s/login instead of localhost:8877/s/login, dropping the port completely and ending with connection refused. Requests to port 8100 work, to 8877 not at all.  
I also have a problem when using Nginx TLS proxy, Mautic redirects from [http://address:5000](http://address:5000) to [https://address/](https://address/), dropping port and also changing from http to https for some reason, unfortunately I am not able to get configuration of TLS proxy but I guess the problem is similar.

Here is nginx.conf of Mautic Nginx

```
worker_processes 5;
worker_rlimit_nofile 8192;

error_log /dev/stderr;

pid /tmp/nginx.pid;

events {
  worker_connections 4096;
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;
    client_body_buffer_size 1024M;
    client_max_body_size 1024M;

server {
    listen 5000;
    server_name example.com www.example.com;
    root /var/www/html;
    index index.php;
    error_page 404 /index.php;
    proxy_set_header Host $http_host;

  location / {
           try_files $uri /index.php$is_args$args;
  }

  location ~* \.php$ {
    fastcgi_pass 127.0.0.1:9000;

    include fastcgi_params;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    fastcgi_param SCRIPT_NAME $fastcgi_script_name;
  }
}

}

```

Here is my Nginx proxy config:

```
worker_processes 5;
worker_rlimit_nofile 8192;

events {
  worker_connections 4096;
}

http {
server {
        listen 8877;

        location / {
                proxy_pass http://localhost:8100;

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

                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "Upgrade";
       }
}
}

```

These errors are showing in the log:  
I can see that Mautic receives correctly the request but it does 302 redirect(port dropping) or 301 redirect(both port dropping and https redirect).

Steps I have tried to fix the problem:  
I tried various Mautic Nginx configs shared by other people, none of them works correctly.

EDIT:  
It seems that the problem may be because of bad “Location” headers that store absolute paths with full URLs instead of relative paths, is there a way to fix it?

---

<div class="post-metadata">

**Author:** ![codes9](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/codes9/32/682_2.png) [@codes9](https://forum.mautic.org/u/codes9)\
**Post date:** [October 31, 2020, 10:48pm UTC](https://forum.mautic.org/t/port-is-lost-when-running-mautic-behind-proxy/16350/2 "2020-10-31T22:48:22Z")

</div>

This is more a Ngnix issue than a Mautic issue. You should post this on Ngnix forums and see if you get help there.