Event Message:

The user connected to port number has been disconnected due to inactivity.

Source Event Log Event ID Event Type
RemoteAccess System 20010 Error

Explanation:

The Remote Access Service by default disconnects users after 20 minutes of inactivity. The amount of time to disconnect is configurable through the Autodisconnect parameter in the Remote Access parameters section of the Registry.

User Action:

Redial and then reconnect to the port.