Connecting to Team City Nuget Server via Visual Studio 2015

Hi

 I was successfully building and packaging my project and then pulling the nugget package via visual studio. 

I have been attempting to get the Nugget Symbol server working.

I set this up as per the instructions,  https://blog.jetbrains.com/teamcity/2015/02/setting-up-teamcity-as-symbol-and-source-server/ 

I then amended my NuGet Pack build configuration step and ticked the options Create tool package and Include source and symbols,  the project built and I can see in the artifacts the nugget package and the symbols nugget package. 

I then returned to Visual studio and attempted to download the package. however I now keep getting a 401 unauthorised response.  I have attempted removing the change I applied and rebuilding the package but continue to get this issue.  I have tried to restarted the  team city services but still not joy.

I have confirmed my username and password and attempted to setup a new user. but I am now unable to authenticate against the Teamcity Nuget Server.

I have taken the URL from VS2015 and pasted into a web browser

http://uhsapp2/httpAuth/app/nuget/v1/FeedService.svc/Search()?$filter=IsLatestVersion&searchTerm=paragon&targetFramework=net45&includePrerelease=false&$skip=0&$top=26 

This asks me to authenticate and then gives me a 501 error.

regards

Tom Williams