Bug ID 744407: While the client has been closed, iRule function should not try to check on a closed session

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP APM(all modules)

Known Affected Versions:
13.1.1,,,,, 13.1.3,,,, 14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,, 15.0.0, 15.0.1,,

Fixed In:

Opened: Sep 18, 2018

Severity: 3-Major


tmm cores. System posts a message: access::session exists is used during CLIENT_CLOSED iRule event.


tmm may core. Traffic disrupted while tmm restarts.


-- Client has closed the connection. -- iRule function tries to check on a closed session. -- An 'access session::exists' command is used inside the iRule event CLIENT_CLOSED.


Do not use the iRule command 'access session::exists' inside CLIENT_CLOSED.

Fix Information

Command execution of 'access::session exists' is now prevented in the iRule event CLIENT_CLOSED.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips