How to Setup a Reverse Proxy in OMV with Let’s Encrypt SSL for Sabnzbd, Radarr, Sonarr and Transmission

After showing you how to configure SABnzbd, Sonarr and Radarr to use Let’s Encrypt’s free SSL-certificates via Reverse Proxy in OpenMediaVault, I’ll do the same with Transmission. What’s cool about this torrent application, is that it’s incredibly easy to configure for this purpose. Let’s begin.

How to Configure a Let’s Encrypt SSL-Secured Reverse Proxy for Transmission using Nginx

I assume you’ve installed Transmission using the Repository. Transmission’s Web Interface is very limited when it comes to options, etc. So the settings you must configure are located inside OpenMediaVault. Make sure you’re logged in to OMV’s Web Interface and follow the steps below:

Configure Transmission to use Nginx Reverse Proxy and Let's Encrypt SSL-certificates

Configure Transmission to use Nginx Reverse Proxy and Let’s Encrypt SSL-certificates

  1. Located underneath ‘Services‘ should be a menu-item, called ‘BitTorrent‘. Open it.
  2. Inside the ‘Settings‘-tab is a section, titled ‘RPC/Web Interface Settings‘. Take note of the ‘port‘ inside it (default: 9091).
  3. Change the value in the ‘URL‘-field to ‘transmission‘. This will act as the prefix to all requests to the above port.
  4. Click ‘Save‘.

Now Transmission will prefix any requests to its local port with ‘/transmission/‘. All we need to do now is make Nginx listen to all requests containing that URI.

Configuring a Nginx Reverse Proxy for Transmission in OpenMediaVault (OMV)

Transmission is configured to prefix all requests to its application. Now we need to tell Nginx where it needs to forward these requests. I.e. where (which port) Transmission is located.

  1. Open a terminal and connect to your NAS using SSH.
  2. Edit the following .conf file using your favorite terminal text editor, e.g. nano /etc/nginx/openmediavault-webgui.d/apps.conf (if it doesn’t exist yet it will be created!)
  3. Insert the following snippet:
    location /transmission {
    proxy_pass http://localhost:9091/transmission;
    view raw apps.conf hosted with ❤ by GitHub
    If the server_name-node already exists and it contains the webadress (e.g. and local IP-address (e.g. of your OpenMediaVault-server, don’t replace it. Skip that and only add the location-node to the list of rewrites. Make sure the port after localhost is the same as the SSL-port you saw earlier in Transmission’s SSL settings (default: 9091).
  4. Save the file and restart Nginx:service nginx restart[/shell]

The settings should be effective immediately. To confirm if Transmission is reachable using your brand-new Let's Encrypt SSL Reverse Proxy, go to If you updated your DNS-configuration to forward to your NAS within the last few hours, it might take a while before your NAS is reachable from outside your LAN. Your new DNS-settings need to be propagated across all internet providers worldwide.

There you go! You can now access Transmission's Web Interface through a Reverse Proxy using a Let's Encrypt SSL-Certificate and Nginx. As you can see it's not that difficult to set this up in OpenMediaVault.

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