The hostname could not be parsed

[J.huebner_9077]

Hey, i am trying to mgirate from nexus to proget for my chocolatey instance. I have everythign setup and it seems correct, but when i try to request data from the proget instance i get an error 500 on the client side and this in the proget logs:

An error occurred processing a GET request to https://my.domain.org:8625/nuget/ChocolateyInternal/v3/index.json: Invalid URI: The hostname could not be parsed.

System.UriFormatException: Invalid URI: The hostname could not be parsed.
   at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind, UriCreationOptions& creationOptions)
   at Inedo.ProGet.Feeds.Feed.GetProGetBaseUrl()
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
   at System.Lazy`1.CreateValue()
   at Inedo.ProGet.WebApplication.FeedEndpoints.NuGet.V3.ServiceIndexHandler.WriteIndex(NuGetFeed feed, AhHttpContext context)
   at Inedo.ProGet.WebApplication.FeedEndpoints.NuGet.V3.ServiceIndexHandler.ProcessRequestAsync(NuGetFeed feed, WebApiContext apiContext, AhHttpContext context, String relativeUrl)
   at Inedo.ProGet.WebApplication.FeedEndpoints.NuGet.NuGetFeedHandler.ProcessRequestAsync(AhHttpContext context, WebApiContext apiContext, NuGetFeed feed, String relativeUrl)
   at Inedo.ProGet.WebApplication.FeedEndpoints.FeedEndpointHandler.FeedRequestHandler.ProcessRequestAsync(AhHttpContext context)

::Web Error on 1/15/2026 12:17:23 PM::

I have no idea what this error could mean. My https settings look like this:

[atripp]

Hi @Julian-huebner_9077,

This error is occurring while ProGet is trying to generate the "base url". There are a few inputs that go into this:

• Admin > Advanced Settings > Base URL
• X-Forwarded Headers, set by a reverse proxy like ngnix

If any of those have an invalid host name (which is what the error is indicating), then you'll get this error. In most cases, it's a typo in the X-forwarded headers.

Thanks,
Alana