Original Publication Date: 02/25/2009
Updated Date: 10/02/2013
This is the result of a known issue. When the BIG-IP system restarts the BIG-IP ASM bd process, the system may report a Tcl error message in the /var/log/ltm file. The error message appears similar to the following example:
tmm tmm: 01220001:3: TCL error: plugin_rules <HTTP_REQUEST> - while executing "PLUGIN::disable ASM"
The error message is benign and you can safely ignore it.
When the BIG-IP ASM bd process restarts, all internal connections from bd to TMM are halted. If the system receives an HTTP request on a halted connection, the system's attempt to disable the BIG-IP ASM plugin connection to TMM fails and the system logs the error message.
After restarting the BIG-IP ASM bd process, the system re-establishes all internal connections to TMM to allow the BIG-IP ASM to process traffic.
F5 Product Development tracked this issue as ID 221917 (formerly CR100240). As a result of architectural changes, this issue does affect BIG-IP 10.0.1 or later.