TeamCity NuGet Feed - "Server Error in '/' Application"

 Hi!

Literally a couple of hours ago I caught such a mistake. The NuGet repository stopped work. The reason is unknown and there are no errors in the logs or I just do not see them. I was try to clear buildsMetadata cache, but no changes.

Which is noteworthy if go locally to the link: http://localhost:3001/guestAuth/app/nuget/v1/FeedService.svc/ everything is working.

Does anyone have any idea how to solve this problem?

Web-Server: IIS (with reverse proxy)

TeamCity version is 2017.2.3 (build 51047)

UPD

I was found solution for my case. :) Need to change "Managed pipeline mode" from Integrated to Classic.