You receive a notification that long-lasting Telnet connections to a mainframe are dropped after an hour of
inactivity. Reviewing SmartView Tracker shows the packet is dropped with the error:
Unknown established connection
How do you resolve this problem without causing other security issues? Choose the BEST answer.
A. Increase the service-based session timeout of the default Telnet service to 24-hours.
B. Ask the mainframe users to reconnect every time this error occurs.
C. Increase the TCP session timeout under Global Properties > Stateful Inspection.
D. Create a new TCP service object on port 23 called Telnet-mainframe. Define a service- based session timeout of 24-hours. Use this new object only in the rule that allows the Telnet connections to the mainframe.