SAP ASE uses the KEEPALIVE option of the TCP/IP protocol to detect inactive clients.
When a connection to a client is inactive for a period of time (the timeout period), the operating system sends KEEPALIVE packets at regular intervals. If it does not receive a response from the client machine for any of these packets, the operating system notifies SAP ASE that the client is no longer responding. SAP ASE then terminates the client’s connection.
The KEEPALIVE default timeout period is 2 hours (7,200,000 ms). To display the current time value, use the appropriate command for your platform.