have you tried to capture packet and see what is going on?
attachment is my configuration and this is /var/log/ltm.
[root@ve1023:Active] config tail -f /var/log/ltm
Dec 26 01:17:58 local/tmm info tmm[26866]: Rule myrule : comcode: 257
Dec 26 01:17:58 local/tmm info tmm[26866]: Rule myrule : comcode: 272
Dec 26 01:17:58 local/tmm info tmm[26866]: Rule myrule : result code: 5012
Dec 26 01:17:59 local/tmm info tmm[26866]: Rule myrule : comcode: 272
Dec 26 01:17:59 local/tmm info tmm[26866]: Rule myrule : result code: 5012
Dec 26 01:18:00 local/tmm info tmm[26866]: Rule myrule : comcode: 272
Dec 26 01:18:00 local/tmm info tmm[26866]: Rule myrule : result code: 5012
Dec 26 01:18:01 local/tmm info tmm[26866]: Rule myrule : comcode: 272
Dec 26 01:18:01 local/tmm info tmm[26866]: Rule myrule : result code: 5012
Dec 26 01:18:02 local/tmm info tmm[26866]: Rule myrule : comcode: 272
Dec 26 01:18:02 local/tmm info tmm[26866]: Rule myrule : result code: 5012
Dec 26 01:18:03 local/tmm info tmm[26866]: Rule myrule : comcode: 272
Dec 26 01:18:03 local/tmm info tmm[26866]: Rule myrule : result code: 5012