Hello everyone, this error has occurred - 
Microsoft recommends fixing this as follows: Solution from Microsoft
but the problem is that the path indicated in the article
% windir% \ System32 \ inetsrv \ config \ applicationHost.configŃ–
I have neither the \ config folder, nor the applicationHost.config file itself - in which they offer to make salutary changes to solve the problem.
What to do?
Has moved from a dead point - the following has helped:
<security> <requestFiltering> <fileExtensions allowUnlisted="true"> <add fileExtension="." allowed="true" /> <remove fileExtension=".cs" /> </fileExtensions> </requestFiltering> - Ie, "stupidly" set filters for file extensions - removing them with remove and setting allowUnlisted="true" notorious instructions from Microsoft, I mentioned above — do not help, but only interfere. Now gives an error
HTTP Error 404.0 - Not Found