Octopus is unable to connect to Team City thru External Feeds

Hi Team, please help me to fix this issue

Octopus is unable to connect to TeamCity thru External Feeds
Error Details:
Octopus v2018.10.9
The V2 feed at ‘http://rstcs-ind.noam.fadv.com/httpAuth/app/nuget/v1/FeedService.svc/Search()?$filter=IsAbsoluteLatestVersion&searchTerm=‘da’&targetFramework=’’&includePrerelease=true&$skip=0&$top=10&semVerLevel=2.0.0’ returned an unexpected status code ‘404 Not Found’.
NuGet.Protocol.Core.Types.FatalProtocolException
at NuGet.Protocol.V2FeedParser.<>c__DisplayClass53_0.<LoadXmlAsync
at NuGet.Protocol.HttpSource.ProcessResponseAsync
at NuGet.Protocol.V2FeedParser.LoadXmlAsync
at NuGet.Protocol.V2FeedParser.QueryV2Feed
at NuGet.Protocol.V2FeedParser.Search
at NuGet.Protocol.PackageSearchResourceV2Feed.SearchAsync
at Octopus.Shared.Util.TaskExtensions.PrepareForRethrow(Exception exception)
at Octopus.Shared.Util.TaskExtensions.SafeResult[T](Task1 task, CancellationToken cancellationToken) at Octopus.Core.Packages.NuGet.ExternalHttpNuGetPackageFeed.SearchForPackagesNamedLike(String packageId, Int32 take, CancellationToken cancellationToken, Boolean exactPackageIdMatch) at Octopus.Core.Packages.NuGet.ExternalHttpNuGetPackageFeed.SearchPackages(String term, CancellationToken cancellationToken, Int32& total, Int32 skip, Int32 take) at Octopus.Server.Web.Api.Actions.PackageSearchAction.ExecuteRegistered() at Octopus.Server.Web.Infrastructure.Api.Responder1.Respond(TDescriptor options, NancyContext context)
at System.Dynamic.UpdateDelegates.UpdateAndExecute3[T0,T1,T2,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2)
at Octopus.Server.Web.Infrastructure.OctopusNancyModule.<>c__DisplayClass14_0.<get_Routes>b__1(Object x)
at Nancy.Routing.Route.<>c__DisplayClass4.b__3(Object parameters, CancellationToken context)

I tried with resident team city (Feeder) source url with latest Octopus version I got below error. But I used one of the open source feeder url its working fine. Can you please guide me regarding this.
Our Teamcity: http://rstcs-ind.noam.fadv.com/httpAuth/app/nuget/v1/FeedService.svc/

Below open source url is working fine: http://teamcity.octopusdeploy.com/guestAuth/app/nuget/v1/FeedService.svc/

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