Nextcloud desktop Linux Appimage doesn’t work behind authenticated proxy.
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Downloaded the latest Appimage https://github.com/nextcloud-releases/desktop/releases/download/v3.9.0/Nextcloud-3.9.0-x86_64.AppImage on a Linux Desktop machine
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Run the AppImage with --appimage-extract option which will create the folder with the app components
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Start the application with the executable shell script
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The desktop app shows the ‘Add Nextcloud account’ window to connect to the Nextcloud account
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Fill in the Nextcloud server address and click Next
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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.