Synology DSM 3.1-1605 - HTTPS for cpanel

Synology changed the location of where you set the HTTPS option for cpanel.

In firmwares before 3.1-1605 it was in Control Panel > Web Services > HTTP Service Options > Configure HTTPS then select "Enable HTTPS connection".

With 3.1-1605 you have to go to Control Panel > DSM Settings > HTTP Service then select "Enable HTTPS connection".

At least the automatic redirection from HTTP to HTTPS works now!

Along the way I was getting an error

SSL received a record that exceeded the maximum permissible length.
(Error code: ssl_error_rx_record_too_long)

This turned out to be because I was trying HTTPS on the HTTP port 5000. As soon as I tried HTTP on 5000 connection was OK.

Also, the firmware simply will not upload / update over HTTPS, so you need to turn HTTPS redirection off (now it works) to be able to update the firmware.