Bug ID 605175: Backslashes in monitor send and receive strings

Last Modified: Sep 13, 2023

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

Known Affected Versions:
11.5.4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 11.6.1, 11.6.2, 11.6.3,,,,, 11.6.4, 11.6.5,,,, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2, 12.1.0, 12.1.1, 12.1.2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6

Opened: Jul 15, 2016

Severity: 3-Major

Related Article: K92903310


After creating a monitor using the GUI containing a recv parameter with a backslash such as '\* OK', loading the configuration generates a validation error: 01070753:3: Monitor /Common/test recv parameter contains an invalid regular expression (Invalid preceding regular expression). Unexpected Error: Loading configuration process failed. Attempting to configure the same monitor via tmsh throws the validation error before creating the monitor, but the GUI allows the single backslash. Two backslashes are required in this case.


Configuration fails to load after it is successfully created via the GUI. The GUI accepts this when it should throw a validation error: two backslashes are required.


Using the GUI to configure a monitor, whose receive string needs to look for a backslash, and only a single backslash is entered in the GUI.


When configuring the monitor via the GUI, use two backslashes instead of one.

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips