Recently deploying old ASP.NET application into Windows server 2012 we faced Unknown error popup box error. In application used ATLAS toolkit to perform async operation. After deploying the application, We are getting unknown error (popup box) whenever visiting the ATLAS controls page. To resolve this error added the following meta tag in header section of each web page. Otherwise we could add into master page level instead of page level
<meta http-equiv="X-UA-Compatible" content="IE=7" />
This code resolved the error in local environment, but still it throws error after deploying the application in server. To resolve the error in server, go to IIS, change application pool pipeline from Integrated to Classic mode. That's it.
<meta http-equiv="X-UA-Compatible" content="IE=7" />
This code resolved the error in local environment, but still it throws error after deploying the application in server. To resolve the error in server, go to IIS, change application pool pipeline from Integrated to Classic mode. That's it.
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