Upload / Download Error - Sorry, but the requested page could not be found - non standard SSL port

Hello collegues.

during uploading or downloading data meet next error: “Sorry, but the requested page could not be found”. We are using non standard SSL port in publication: https: // [seafile].[domain].net:4443 in our deployment. I’ve alredy read a lot of topics about similar problem but still can’t understand what are do we need to change. By the way, internally using URL https: // [seafile].[domain].net these features also don’t work.

Fresh installation on Ubuntu with Apache.
Seafile Server Version: 7.0.4

Thank you,