Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

john4665f5's avatar
john4665f5
Icon for Nimbostratus rankNimbostratus
Apr 26, 2016

Default HTTP/HTTPS monitor acceptable HTTP status codes?

Hello,   I've been digging through F5's LTM documentation, but I am not able to find anything solid on the default acceptable HTTP/HTTPS monitor status codes. What is the LTM expecting back using ...
application delivery
LTM
Kevin_Stewart's avatar
Kevin_Stewart
Icon for Employee rankEmployee
Apr 26, 2016

Take a look at these references:

 

https://support.f5.com/kb/en-us/solutions/public/11000/300/sol11359.html?sr=53330875

 

https://support.f5.com/kb/en-us/solutions/public/3000/200/sol3224.html

 

And most important: https://support.f5.com/kb/en-us/products/lc_9_x/manuals/product/lc-monitors-reference-11-6-0/1.html?sr=53331011

 

You can also use the default null Receive String value [""]. In this case, any content retrieved is considered a match. If both the Send String and Receive String fields are left empty, only a simple connection check is performed.