Looks like an application layer protocol inspection or fixup in the old versions.http://www.cisco.com/en/US/docs/security/asa/asa72/configuration/guide/inspect.htmlHave setup this for tcp port 24 ?Take a look in your config.

Depends how many of them you get.Basicly there is no entry in the stateful firewall table of an initial SYN request so the Firewall is refusing the connection.Cause: a.) Asymetric routingb.) timout issues http://www.cisco.com/en/US/docs/security/asa/...

Start with a " show interface " command and look for error codes.Here is also a good guide for troubleshooting this kind of issues.http://www.cisco.com/en/US/docs/security/asa/asa70/configuration/guide/intrface.htmlCheck that you have the same interf...