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NuGet Proxy Repositories


Notable Compatibility Change for H2 or PostgreSQL Database Deployments

In Sonatype Nexus Repository release 3.43.0, we added compatibility with official NuGet v2 clients. The supported subset of the legacy NuGet v2 protocol is the same as that supported by Microsoft's NuGet Gallery, Use cases that rely on the deprecated parts of the v2 API are not supported, including many common Chocolatey use cases and some custom OData queries.

The NuGet Gallery is the common repository used by all package authors and consumers. To reduce duplicate downloads and improve download speeds for your developers and CI servers, you should proxy the NuGet Gallery with the repository manager. If you use other external repositories, you should also proxy these. A default installation of the repository manager has the NuGet gallery set up as a proxy repository with the name

To proxy another external NuGet repository, you simply create a new nuget (proxy) as documented in Repository Management. The Remote Storage has to be set to the URL of the remote repository you want to proxy. The default configuration for proxying the NuGet Gallery is partially visible in Figure: “NuGet Proxy Repository Configuration for the NuGet Gallery” and uses the URL of the API


Figure: NuGet Proxy Repository Configuration for the NuGet Gallery

By default, searches in NuGet proxy repositories in the repository manager initiated by a client like nuget or VisualStudio will be passed through to the remote repositories. The search results are merged with internal search results and included in an internally managed index. This merging has to make some assumptions to generate component counts. These counts should therefore be considered approximate numbers.

Once complete the V3 entry point for the proxy repository becomes: <nexus-host>:<nexus-port>/repository/<repository-name>/index.json (e.g., http://localhost:8081/repository/nuget-proxy-v3/index.json). This is the package source that should be passed to the nuget client in order to work with packages.

Read more about the API at has updated its package service to version 3 which provides significant performance improvements over its legacy version 2 (OData-based) service. The V2 endpoint ( is still supported but not recommended. To use this or any V2 endpoint, you can use the NuGet V2 entry in the Protocol version field.

Note that support for NuGet v2 in a PostgreSQL or H2 environment is compatible with Microsoft's NuGet Gallery, which means it does not support custom OData queries.


Failure to use the correct Nexus Repository URL or incorrect NuGet version protocol will cause the repository to process requests using the V2 API. If the Remote Storageis pointing to a V3 Service Index this will provide no results for package requests and potentially cause build errors.


$ nuget list packageid:newtonsoft.json -Source http://localhost:8081/repository/nuget-proxy-v3/index.json
Newtonsoft.Json 12.0.3

$ nuget install newtonsoft.json -Source http://localhost:8081/repository/nuget-proxy-v3/index.json
Feeds used:

Installing package 'newtonsoft.json' to '/workspace/nuget'.
  CACHE http://localhost:8081/repository/nuget-proxy-v3/v3/registration/5/newtonsoft.json/index.json

Attempting to gather dependency information for package 'newtonsoft.json.12.0.3' with respect to project '/workspace/nuget', targeting 'Any,Version=v0.0'
Gathering dependency information took 19.78 ms
Attempting to resolve dependencies for package 'newtonsoft.json.12.0.3' with DependencyBehavior 'Lowest'
Resolving dependency information took 0 ms
Resolving actions to install package 'newtonsoft.json.12.0.3'
Resolved actions to install package 'newtonsoft.json.12.0.3'
Retrieving package 'Newtonsoft.Json 12.0.3' from 'http://localhost:8081/repository/nuget-proxy-v3/index.json'.
  GET http://localhost:8081/repository/nuget-proxy-v3/v3/content/0/newtonsoft.json/12.0.3/newtonsoft.json.12.0.3.nupkg
  OK http://localhost:8081/repository/nuget-proxy-v3/v3/content/0/newtonsoft.json/12.0.3/newtonsoft.json.12.0.3.nupkg 567ms
Installing Newtonsoft.Json 12.0.3.
Adding package 'Newtonsoft.Json.12.0.3' to folder '/workspace/nuget'
Added package 'Newtonsoft.Json.12.0.3' to folder '/workspace/nuget'
Successfully installed 'Newtonsoft.Json 12.0.3' to /workspace/nuget
Executing nuget actions took 935.87 ms