Nextcloud desktop linux appimage doesn’t work behind authenticated proxy

Nextcloud desktop Linux Appimage doesn’t work behind authenticated proxy.

  • Downloaded the latest Appimage on a Linux Desktop machine

  • Run the AppImage with --appimage-extract option which will create the folder with the app components

  • Start the application with the executable shell script

  • The desktop app shows the ‘Add Nextcloud account’ window to connect to the Nextcloud account

  • Fill in the Nextcloud server address and click Next

  • Error message saying ‘Failed to connect to Nextcloud at server address: Proxy requires authentication’

I didn’t find the setting to configure the app with the proxy address, username and password.