User disconnection not informing Server

[PiggyBank1974]

At work we use External USB Modem for the users that are reporting on site, as there is no permanent internet facility available.

I

 

[PlausiblyDamp]

Could the server track how long it is since a particular client sent anything and if it is past a particular threshold have the server close the port.

The client could periodically send a dummy request to the server to keep the connection alive if it hasnt actually had any real information to transmit.

 

[MrPaul]

Ping

If the server periodically sends a "ping" style message to the client, eventually network failures will be detected by the underlying transport protocols and then get propagated back to your server application to handle appropriately.

Good luck