Configuring VPN Remote Access for the first time on your Sophos XG Firewall? Check out this useful Community post!
Sophos Network Agent would disconnect the user when authenticated from an Android device while the application is running in the background.
This is normal behavior as the application, when installed on an Android device, has battery optimization enabled.
Applies to the following Sophos products and versions Sophos Firewall
The communication between the XG Firewall and the Network Agent would operate on 9922:TCP port and would use TLS1.2. When the app is running in the background with battery optimization, the communication would cause to break and an "Encrypted Alert" message is sent to the XG Firewall that would force the user to log off immediately.
This Alert type 21 is sent from the Network Agent, which mean it could not decrypt the communication which would close the SSL communication.
When this occurs, you need to allow the application to run without battery optimization.
To disable battery optimization on your Android device, navigate to Settings > Battery > Battery Optimization > Network Agent > Don't Optimize
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