Monitoring WebServer behind Reverse Proxy

Question

Hi all,  
&nbsp;    
&nbsp;  I am hoping someone can help.  
&nbsp;    
&nbsp;  I have a virtual server with 16 nodes which are reverse proxied to our internal network using the IP address.  The problem I am having is that because I am using the IP address I can't monitor if IIS is up or down.  If I switch IIS off the monitor still thinks it is up.  Is there any way around this? 
&nbsp;  
&nbsp; Any help would be appreciated. 
&nbsp;  
&nbsp; Nick

hoolio · Answer

Do you have an HTTP monitor configured?  If not, you can configure one to perform an application layer check of the web servers.  A typical send string would be: 
&nbsp;  
&nbsp; GET /path/to/file HTTP\1.1
Host: 
Connection: close
 
&nbsp;  
&nbsp; The receive string should be content that is only found when the application is up and responding correctly.  As Deb pointed out recently, you shouldn't use 200 as this is often found in the Date header.  HTTP would also be a bad option as it's included when the application sends any HTTP response code. 
&nbsp;  
&nbsp; Aaron

Forum Discussion

AppWorld Berlin iRules Contest!

F5 AppWorld 2026 Las Vegas - iRules Contest Winners!

Recent Discussions

monitor/healthcheck issue with envoy gateway

Recommendation for Adv. Lab

Changes to DO and AS3 GitHub - no longer monitored

How to Verify config before loading to F5

Logical Disk Full to Migrate rSeries

Related Content

LTM Monitoring IIS and Webserver Binding

Update an ASM Policy Template via REST-API - the reverse engineering way

Proxy pacfile hosting without need for Webservers using iFiles on v11

Re: F5 BIG-IP SSL Orchestrator and Reversing Labs Integration Guide

Troubleshooting Lync/Skype for Business Reverse Proxy