Summarized Changelog

• Fix issue where MTU could not be manually set in the app.
• Lower the max MTU from the automatic MTU detection down to 1380, which was the hardcoded default before the automatic detection was implemented. This solves issues where the physical interface MTU was set higher than it could actually transport.

Fixes T10299 T10308

Check daemon for errors, connect to server, check connection using https://mullvad.net/en/check/