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Community Member

ACE how to debug probes


We have several probes configured for our serverfarms. Some of the probes and rservers are alerting for timeouts or regex's not found etc.

What's the best way to check if this is a rserver or probe problem ? Using captures ?

Or is it possible to debug the probes ?



Cisco Employee

Re: ACE how to debug probes

The best solution is to use sniffer trace.

The debug would tell you there is a problem but you still will not be sure where it comes from.

So, go for the sniffer trace.


Community Member

Re: ACE how to debug probes

Hi Gilles,

I am trying to capture the packets but i run into a problem :

I create an access-list :

access-list CAPTURE1 line 8 extended permit ip any host

access-list CAPTURE1 line 16 extended permit ip host any

The I create the capture :

capture CAPTURE all access-list CAPTURE1 bufsize 5000 circular-buffer

Start the capture :

capture CAPTURE start

Make some bogus connection :

telnet 80


Connected to

Escape character is '^]'.

HTTP/1.1 400 Bad Request

Server: Microsoft-IIS/5.0

Date: Tue, 15 Apr 2008 11:44:35 GMT

Content-Type: text/html

Content-Length: 87

ErrorThe parameter is incorrect. Connection closed by foreign host.

Stop the capture :

capture CAPTURE stop

Then when i want to display the results, nothing is displayed :

sh capture CAPTURE

What am I doing wrong here ?



Community Member

ACE how to debug probes

I have had the same problem. Contacted TAC. Was told that Capture feature of ACE does not support capturing traffic for probes, but only works with traffic to/from VIPs. That was a disapointment.  The problem with using the sniffer is if your probes are HTTPS that are encripted which is what I am having an issue with right now.  

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