Error message errdefs_msgno="01480010:6:"] Got a message(74) for a non existent flow

Recently had to filter some messages from tmm (for starting tcpdump). Here's what worked for me. This was from "creating a log filter" in the tmos implementations" manual. In the UI:

System --> Logs --> Configuration --> Log Filters
Create a filter. Informational, tmm, message ID <8 digits>, publisher "None".

The config:

sys log-config filter myfilter {
   app-service none
   description none
   level debug
   message-id 013e0001
   publisher none
   source all
   }

https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/tmos-implementations-11-4-0/23.html

Regarding the log reason; the message seems to indicate LTM is received traffic that it isn't configured to process. I'd investigate the source of that as well.

Kevin