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

Forum Discussion

Håkan_135754's avatar
Håkan_135754
Icon for Nimbostratus rankNimbostratus
Sep 18, 2018

Client initiated form based SSO fails.

Hi, I'm trying to setup "client initiated form based SSO" in APM. I have a very simple test form but APM complains about that it isn't HTML in the response. I always get the error: Sep 18 17:07:...
application delivery
BIG-IP Access Policy Manager (APM)
Nicolas_Destor's avatar
Nicolas_Destor
Icon for Cirrostratus rankCirrostratus
Sep 19, 2018

Hi,

 

I suggest you to check the html source code of the logon page.

 

According to the error "non-HTML response received", the logon page seems to be not well formated. By consequence F5 device can't parse the page to extract/fill automatically the input fields required for SSO.