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

Forum Discussion

DNG_23691's avatar
DNG_23691
Icon for Nimbostratus rankNimbostratus
Oct 27, 2009

.NET vs. HTML Basic Monitoring

Problem: I can use a basic http monitor to query a .html page and get a response text with no issue. However, if I use a .NET page (.aspx) it will fail. The response text in the browser is correct,...
management
monitoring
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Oct 28, 2009
If you enable bigd debug (b db bigd.debug enable / disable) and check the log file (/var/log/bigdlog), do you see a valid response being marked as failed? What does the debug log show for the response which should contain "Hello"?

 

 

RFC2616 states the delimiter between HTTP header lines is a \r\n not just \n. Depending on version, bigd automatically appends one or two \r\n's to the send string before sending it to the pool members. Could you try changing the send string to:

 

 

GET /HealthCheck.aspx HTTP/1.1\r\nHOST:www.xyz.com\r\nConnection: Close\r\n

 

or

 

GET /HealthCheck.aspx HTTP/1.1\r\nHOST:www.xyz.com\r\nConnection: Close

 

 

Aaron