Redirect HTTP to HTTPS on Synology NAS

When having the Synology DSM open on port 5000/5001 I can configure it to always redirect to 5001 (HTTPS). But now I have created a custom sub-domain and a rule in the reverse proxy to route traffic on this sub-domain with HTTPS/443 to localhost:5000 so that I don't have to expose port 5000/5001 directly. But now I can't get the auto-redirect to work anymore. If entering http://nas.mydomain.com:80 I don't get redirected to port 443 but to 5001 which is closed. Can I configure it to redirect to 443 instead?

Solution 1:

Synology DSM Menu > Control Panel > External Access -change http to 80 and https to 443 like this (Control Panel example setup)

No need to forward the ports just changes them in the control panel since from a security point of view its the same just what you are doing adds extra work and more resource usage from the NAS.

Solution 2:

I was also trying to configure remote access to my Synology via HTTPS on default port 443 I managed to achieve it with these steps:

1. Configure external ports in DSM Menu > Control Panel > External Access > Advanced tab (set DSM (HTTPS) port 443)
2. Configure port forwarding on router where external port 443 is redirected to Synology NAS port 5001 (the HTTPS port that is configured in Control Panel > Network > DSM Settings, 5001 is the default one)