Symptoms
Since installing RAS Web Portal 16.5.0.20264 you receive "Server Error in '/2XWebPortal' Application" when trying to access it:

To get the detailed error message, please do the following:
1. Set customErrors mode to "Off" in C:\inetpub\wwwroot\2XWebPortal\web.config file:

2. Restart World Wide Web Publishing Service (W3SVC).
You will see the following error regarding unhandled exception:

Cause
The issue is caused by the update of OpenSSL library. Now it requires the Microsoft Visual C++ 2010 Redistributable to load.
Resolution
You need to upgrade RAS Web Portal to version 16.5.1 (20452).
Workaround:
Please download and install the C++ Redistributable package to resolve the issue in previous versions
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