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Akeem's avatar
Akeem
Icon for Nimbostratus rankNimbostratus
Apr 02, 2020

Persistence Issue on LTM

Please advise if possible Issue:

 

Intermittent ASP.NET times-outs occurring intermittently when accessing an ASP.NET based application when using a pool of load balanced servers with the HTTP Cookie Insert option selected for persistence.  No issues occur when using single pool member.

 

The back-end application is running IIS 8.5 Server log error is:

 

2020-04-01 11:21:13 10.71.244.57 POST /AthenaCustody/Pages/AjaxMethods.aspx/LogJavascriptError - 80 - 10.71.244.1 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/80.0.3987.122+Safari/537.36 http://ppfeglcnaweb01/AthenaCustody/Pages/Arrest.aspx?CustodyRecordId=0 500 0 0 0

 

 

application delivery
LTM

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  • Simon_Blakely's avatar
    Simon_Blakely
    Icon for Employee rankEmployee
    Apr 03, 2020

    You need to check the pool member logs to see if that particular session was originally established on another IIS server (probably by tracking the ASP.Net session ID).

     

    You might want to manage the persistence using

    K7392:  Overview of universal persistence

     

    based on something like an ASP.Net session ID.

  • Akeem's avatar
    Akeem
    Icon for Nimbostratus rankNimbostratus
    Apr 03, 2020

    Thanks for the information, I'll investigate your advice and feedback.

     

  • Akeem's avatar
    Akeem
    Icon for Nimbostratus rankNimbostratus
    Apr 06, 2020

    Still investigating the issue.

    I can confirm that when the customer uses the Single-Sign-On URL (https://connect-ppf-full) there are no issues

    However they also use another method called: MockIAM route (http://ppfeglxxxweb01/gemlogin/mockIAM.jsp) , which uses a ReverseByPasss proxy file.

     

    We have an issue with this method I've gathered some TCPDUMPs that we're currently analyzing. Will let you know what the outcome is.