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

Forum Discussion

ctyau_18464's avatar
ctyau_18464
Icon for Nimbostratus rankNimbostratus
Mar 31, 2010

Problem with receive string for HTTPS health monitor

I have a web server configured such that when I type "https://hostname/nesp/app/heartbeat" in a browser it displays "Success" when the server is supposed to be good.     I then created ...
management
monitoring
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Apr 01, 2010
Can you check the server logs? I'd guess you're getting a 500 server error or a 40x client error.

 

 

If you can't check the logs for some reason, can you try a few variations on the send string while looking for "200 OK" in the send string:

 

 

GET /nesp/app/heartbeat /HTTP1.1\r\n Host: \r\nConnection: closed

 

GET /nesp/app/heartbeat /HTTP1.1\r\n Host: \r\nConnection: closed\r\n

 

GET /nesp/app/heartbeat /HTTP1.1\r\n Host: \r\nConnection: closed\r\n\r\n

 

GET /nesp/app/heartbeat /HTTP1.1\r\n Host: 192.168.201.22\r\nConnection: closed\r\n\r\n

 

GET /nesp/app/heartbeat /HTTP1.1\r\n Host: www.example.com\r\nConnection: closed\r\n\r\n (where you replace www.example.com with the virtual host name

 

 

Aaron