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Andi_102219's avatar
Andi_102219
Icon for Nimbostratus rankNimbostratus
Dec 08, 2010

GTM - HTTP check through proxy

Hi,

I try to configure my GTM (v9.4.5) to monitor certain websites on the internet via my balanced proxy servers (ISA 2006).

So I created a TCP based monitor and configured the send string to something like

GET http://blablabla.com HTTP/1.1

First, without a receive string (as this didn't work anyway).

After the monitor is created I assigned it to a specific pool and it started making this GET request through the

proxy (traced the log and GTM interface with tcpdump).

The http request got processed by the proxy and the response delivered back to the GTM. Everything's good so

far but the GTM (cluster of 4 GTMs) marks this pool always to DOWN -> "(state: timeout)"

I also tried it with a HTTP monitor but it's always the same result.

Apart from that I tried to set "\r\n" behind the GET request -> no success

What is my fault?

management
monitoring
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Dec 09, 2010
    Hi Andi,

     

     

    Can you try this send string with a TCP or HTTP monitor and check with tcpdump or the server logs to see what the server status is for the request?

     

     

    GET http://blablabla.com/ HTTP/1.1\r\n\r\n

     

     

    Aaron
  • Andi_102219's avatar
    Andi_102219
    Icon for Nimbostratus rankNimbostratus
    Dec 09, 2010
    I made already a trace on the GTM and the proxy. The request is sent to the proxy and data is delivered

     

    back from the proxy to the GTM (everything successful).

     

    But the GTM marks the pool always as DOWN. Monitor state is "timeout" according to the gtm log.

     

    From a network point of view, data delivery and proxy behaviour - everything's looking fine.

     

     

    I tried a TCP and a HTTP monitor. Both doesn't work! Also with "\r\n\r\n" at the end

     

     

    What's working, apart from that, is a simple TCP check if the proxy port (8080) is alive.

     

    That's a simple HTTP monitor with a send string "GET /" to the service port.

     

  • Andi_102219's avatar
    Andi_102219
    Icon for Nimbostratus rankNimbostratus
    Dec 09, 2010
    I figured it out by myself. It's working if I make the GET request with GET blablabla HTTP/1.0 instead of HTTP/1.1 :-)
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Dec 09, 2010
    Maybe the proxy server doesn't like an HTTP 1.1 request without a host header? If the URI is fully qualified, per RFC2616 you shouldn't need to specify the host header. But anyway, if it's working with 1.0 you should be fine.

     

     

    Aaron