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

Forum Discussion

Dev_56330's avatar
Dev_56330
Icon for Cirrus rankCirrus
Oct 20, 2017

What is the best way to troubleshoot 500 internal server errors from BIG-IP or client?

I have a single web application with multiple uris with all accessible but 1. I am getting a 500 error when accessing through the BIG-IP with LTM+APM 12.1. When going to the web server directly I a...
application delivery
BIG-IP Access Policy Manager (APM)
Dev_56330's avatar
Dev_56330
Icon for Cirrus rankCirrus
Oct 31, 2017

The application owner reviewed his logs and this particular site was logging unknown host when users attempted to access it through the BIG-IP. DNS records were created for the floating IP and the 500 error has not returned.