timeout xlate 1:00:00

timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02

timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00

timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00

timeout uauth 0:05:00 absolute

So your tcp timeout is 1 hour. Are you sure it's FW to close the connection. Can you check log to see what the reason is for the connection to be tear down.

ASA log shows the ftp session was torn down by ASA. It seems that FTP session (communication port 21) was timed out then session was torn down.

what's your asa version.

7.2(2)22

Since you mentioned control channel (port 21) was timeout, I thought it might be related to bug CSCsc91450. But your version should have the fix.

You might try use policy map to change tcp timeout just for FTP/21 connection.

1. define FTP traffic in ACL

2. Define class-map

3. use policy-map and add the following command in the class defined in step 2

"set connection timeout tcp 02:00:00 reset"

4. Apply it to the interface.

If its still not working, open TAC case to investigation.

But my tcp timeout was set to 1 hr? Why FTP/21 is terminated at 10 mins range?

Is it possible to use a tcp-map to change just the timeout for the session in question?

I don't remember the detail of the commands. You can check the command ref to see. If it is FW to tear down the connection, it looks like the default timeout does not work. Therefore, I suggest you to use policy map to change the tcp timeout on FTP only.