TYP-disconnection 1784

We have several Workstations that get a TCP diconnect after about 4 Hours. Only if Navision is running. After restart, they disconnect agin after 4 Hours with the Network errorcode 1784. Other workstations have no problems. Has anybody had the same problems or any surgestions how to fix it ?

The error code 1784 is a TCP error code, does anyone know what it means? Lars Strøm Valsted Head of Project and Analysis Columbus IT Partner A/S www.columbusitpartner.com