Hi,
The error indicates that there was problem at server side... there might be some code in c# which does not work fine when deployed on server. It could be related to permission issue, access issue, database issue etc.
You can login to server and try to browse the web page using http://localhost or, go to web.config file of deployed application and change its
<customerror mode='off'> this will display the detailed error message about the failure and you can fix the relevant issue
This page also list the error message:
https://docs.microsoft.com/en-us/iis/troubleshoot/diagnosing-http-errors/how-to-use-http-detailed-errors-in-iis
Hope it helps.
Best regards,
Fletcher
MSDN Community Support
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