health monitor that worked in 10.0.1 failed with 10.2.1

Hi Meena,

 

 

In 10.2.0, bigd behavior was modified to not append any \r\n's to the end of the monitor send string for HTTP, HTTPS and TCP. If you add two \r\n's to the end of the send string does the pool get marked up?

 

 

See SOL10655 for details:

 

 

sol10655: Change in Behavior: CR/LF characters appended to the HTTP monitor Send string

 

http://support.f5.com/kb/en-us/solutions/public/10000/600/sol10655.html

 

 

Aaron

Aaron,

 

 

I played around with it adding and removing extra CR and LF but cannot bring up the pool. The only work around I have to bring up the pool and the web page is to remove the check for receive string. Tcpdump shows 200 OK string on the response and I have no idea why it fails. I modified the receive string to exactly match the case etc.

 

 

The same monitor works fine for the same servers from Big-IP running 9.4.7 code. When I run the same GET request on the Big-IP CLI (Linux OS), it works fine. It is just the TMOS version 10.2.1 that is having issues.

 

 

Meena

Can you post anonymized send and receive strings that were working in 9.4.7?

 

 

Aaron

This is the monitor that works in 9.4.7 and 10.0.1 but does not in 10.2.1.

 

 

GET / HTTP/1.1\r\nHost : 10.22.0.192\r\n and the receive string is 200 OK.

 

 

GET /login.asp HTTP/1.1\r\nHost: 10.22.0.196\r\nConnection: Close\r\n and the receive string is 200 OK.

 

 

I added extra and removed \r\n but nothing seems to work.

 

 

Meena

Can you try this:

 

 

GET /login.asp HTTP/1.1\r\nHost: 10.22.0.196\r\nConnection: Close\r\n\r\n

 

 

And then start with a receive string of HTTP. If that works, then try 200 OK. If one or both don't work, you can try the steps outlined here to troubleshoot the issue:

 

 

http://devcentral.f5.com/wiki/default.aspx/AdvDesignConfig/TroubleshootingLtmMonitors.html

 

or here:

 

http://support.f5.com/kb/en-us/solutions/public/12000/500/sol12531.html

 

 

Aaron

Ok. I tried this and it is working.

 

 

GET /login.asp HTTP/1.1\r\nHost: 10.22.0.196\r\n\r\nConnection: Close\r\n

 

 

and the receive string is 200 OK. Thanks Aaron.

 

 

Meena

 

That wouldn't be a valid HTTP request as the double \r\n would terminate the request and then you have another HTTP header appended. Can you try it like this:

 

 

GET /login.asp HTTP/1.1\r\nHost: 10.22.0.196\r\n\r\n

 

 

with a receive string of 200 OK?

 

 

Aaron

Yes. I tried that and it is also working.

Hi Meena & Other experts

 

 

I have been using the below string in 10.1 for http service monitoring. But on 10.2 its not working. Any idea how i should be modifying the string?

 

 

GET /CAI3G1.1/services/CAI3G1.1 HTTP/1.0\r\n

 

 

and no receive string 200 OK. used in 10.1.

 

 

I have tried the below and receive string as 200 OK. still not working.

 

 

GET /CAI3G1.1/services/CAI3G1.1 HTTP/1.0\r\n \r\n

 

 

any help would be much appreciated.

 

 

Thanks a lot in advance.

 

 

//Sujan

 

 

Hi Sujan,

 

 

Looks like you might have a space character between your two \r\n sequences? Can you remove that and try again?

 

 

Thanks,

 

Jen