Cisco Bug: CSCte25307 - Telnet NOOP command sent to FWSM causes next character to be dropped
May 05, 2010
- Cisco Catalyst 6500 Series Firewall Services Module
Known Affected Releases
Symptom: Administrators connecting to the Firewall Module via a Telnet client may see times where when they type a character on the command line, it is not echoed back - additionally the character is not accepted by the Firewall Module. This occurs if the client is configured to send a keepalive packet (or anti-idle packet), and the client sends a Telnet NO OP (No Operation) command to accomplish this. The Firewall Module will acknowledge the receipt of the NO OP, but will ignore the next character sent after the NO OP. Customers would observe seeing the following: --> Admin types "show version" --> Admin sees "how version" echoed back (Note the missing 's'). Conditions: A keepalive or anti-idle feature is enabled on the Telnet client.
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