Server Error in '/' Application. A potentially dangerous Request.Path value was detected from the client (:). Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information

Hello Everyone.

I am getting this Error. I installed it today on a server and ensured that php works with 7.3.

Anyone know why this is happening and how I can fix it? It comes when I want to edit the page or add a new one. Basically the ConcreteCMS is unusable atm.

The Installation was successful, but it warned about texts being non capital letter, which I actually checked and don’t think it has it anywhere.

Thank you for your help-

The Error:

Server Error in ‘/’ Application.


A potentially dangerous Request.Path value was detected from the client (:).

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: A potentially dangerous Request.Path value was detected from the client (:).

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[HttpException (0x80004005): A potentially dangerous Request.Path value was detected from the client (:).]
   System.Web.HttpRequest.ValidateInputIfRequiredByConfig() +9923509
   System.Web.PipelineStepManager.ValidateHelper(HttpContext context) +55


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4770.0

Are you running this on IIS server? From the ‘requirements’ page…

“Concrete supports both Apache and Nginx web servers, and has been made to work with IIS in the past. Official support is for Apache and Nginx only.”

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