I believe this is a OS specific bug. I am using custom sync server. Same settings works fine on Linux app, while it doesn’t work on both MacOS and iOS apps. If I clone the repo and run built/run bash script (dev mode), synchronization works (meaning can login to remote custom sync server).
Issue seems to be related to url parsing. When I use bundled MacOS app or iOS app I get the same error “error sending request for url ()”. And naturally there is no request reach to the server. I guess need to wait for the next release to be able to use the apps.
The issue in this thread was about syncing with AnkiWeb not a custom sync server) from Russia, and most of the users appear to be on Windows. Are you sure your issue is related to this?
It’s always best to read the discussion first. There are lots of things that can cause connection errors – some fixable, some not – some related to Anki, some not.