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David_130214's avatar
David_130214
Icon for Nimbostratus rankNimbostratus
Sep 15, 2014

http health monitor shows website is available when it isn't

Hello,

 

We are using a http health monitor to check our websites. However it incorrectly shows the website as available when it is down. Below is config for our health monitor. I'm trying to get what is coming back from our service provider but am not having much luck. I can see from google that we are getting a HTTP/1.1 500 Internal Server Error. If we use http 0.9, the health check always fails. Is there something wrong with my configuration or can you other any suggestions? Thank you in advance!

 

Type ------------- HTTP

 

Parent Monitor -- http

 

Interval ------------- Specify 5 seconds

 

Up Interval --------- Disabled

 

Time Until Up ------ 0 seconds

 

Timeout ------------ Specify 16 seconds

 

Manual Resume --- No

 

Send String ------- GET /docs \r\nHTTP/1.1\r\n Connection: Close\r\n

 

Receive String ----

 

Receive Disable String --

 

User Name --

 

Password --

 

Reverse ----------- No

 

Transparent ------ No

 

Alias Address ---- * All Addresses

 

Alias Service Port* All Ports

 

availability
management

1 Reply

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  • nathe's avatar
    nathe
    Icon for Cirrocumulus rankCirrocumulus
    Sep 15, 2014

    David. I see you've got no Receive String. Therefore, the monitor will successfully mark a pool member up if it receives any content, or headers back. So try adding a receive string. Can be as simple as "200 OK" (without the quotes").

     

    If you run curl from bigip cmd line or fiddler/http fox from a browser you should see the received content when successful and this can help build a robust receive string.

     

    Hope this helps.