Event Message:

The Simple TCP/IP Services could not find the TCP Discard port. The TCP Discard service was not started.

Source Event Log Event ID Event Type
SIMPTCP System 3 Error

Explanation:

This computer will be unable to respond to Discard requests from other systems that use the Discard protocol.

User Action:

Make sure that the entry for this port is in the SERVICES file in the \\<Systemroot>\\SYSTEM32\\DRIVERS\\ETC directory.