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NR416_306804's avatar
NR416_306804
Icon for Nimbostratus rankNimbostratus
Jan 18, 2017

Load Balancing setup question

Hello there. I have strange situation where big-IP is in front of 2 web servers and when one of them (regardless which one) is down -application works as expected. However, the moment both servers are online -trying to access to the URL "sporadically" does not work. I do not have access to big-IP appliance but it was (supposed to be) setup to do URL redirection ONLY (no SSL offloading or any other manipulation with the packets/session). I requested from LAN team to setup session timeout to 1h as that's what application is setup for as well.

 

Both IIS servers are using SessionStateDB and as mentioned above -in "single server" scenario -it all works as expected. What do you think (session cookie? or some kind of timeout?) is causing this?

 

Thanks in advance

 

application delivery
application load balancing
BIG-IP
iis
security

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  • Patrik_Jonsson's avatar
    Patrik_Jonsson
    Icon for MVP rankMVP
    Jan 19, 2017

    Hard to be sure what it could be without knowing more about the application, but I would try to enable cookie persistence first with a timeout of 3600 seconds.

     

    • What are the symptoms when the requests fails?
    • Could you verify with ie. Wireshark that the same tcp connection is used upon failure?
    • Is there any server side failures when the problem occurs that might force the load balancer to switch server?

    /Patrik