Why am I getting HTTP response status 403 when browsing Artifactory package source in Visual Studio Package manager?

[kosa-gyula-77]

To reproduce, browse packages in Visual Studio Package manager by selecting an Artifactory nuget package source that requires authentication.
packageSourceCredentials is set in NuGet.config with the personal Identity Token generated by Artifactory as password.

Visual Studio Package manager does not respond to challenge WWW-Authenticate: Basic according to Fiddler. Only one round trip occurs with Artifactory package source in that the request is responded with 403 HTTP status and WWW-Authenticate: Basic header set.
No subsequent requests are made by Visual Studio.

Further technical details

• Microsoft Visual Studio Professional 2022 (64-bit) Version 17.8.6
• NuGet Package Manager 6.8.0
• Artifactory EnterpriseX license 7.71.8 rev 77108900
• It may be related to Why does Visual Studio package manager not respect "no_proxy" configuration? #13219

[kosa-gyula-77]

Raised as issue at #13228