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BOUABRE_343008's avatar
BOUABRE_343008
Icon for Nimbostratus rankNimbostratus
Aug 28, 2018

Monitor problem

Hello I have a web application that has been inaccessible for some time. But when I change the monitor for an HTTP monitor (monitor by default), services are "OK". What can be the cause of this p...
application delivery
BIG-IP
devops
LTM
  • KevinA_246454's avatar
    KevinA_246454
    Aug 28, 2018

    Hi

     

    Is your web server allowing http 1.0 request ? based on the output it certainty does not look http 1.0 is allowed on the webserver . can you test the below

     

    curl --head --http1.0 and compare it against curl --head

     

jaikumar_f5's avatar
jaikumar_f5
Icon for MVP rankMVP
Aug 28, 2018

Was your webserver recently upgraded. If yes, then there is high chance the monitor is broken. As you claim it was working before and now it has stopped, which questions what happened in the servers. I'd guess your webservers were upgraded and post that monitoring failed.

 

Also the error code 400 bad request logs when the request being sent is having syntax issues. Maybe your send string is having some issues. It could a space or it could be CR/LF anything. You have to figure that out.

 

I recently encountered this issue, check my thread.