CI failure in dotnet/runtime because of rate limiting in a devops NuGet feed

[svick]

Build

https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1455317&view=logs&j=24dced49-d4a4-54d9-37f0-d60d0af2edf3

Build leg reported

Build / osx-x64 Debug Libraries_CheckedCoreCLR / Build product

Pull Request

dotnet/runtime#129150

Known issue core information

Fill out the known issue JSON section by following the step by step documentation on how to create a known issue

 {
    "BuildRetry": false,
    "ErrorMessage": [ "error NU1301: Unable to load the service index for source https://pkgs.dev.azure.com/dnceng/public/_packaging/", "Response status code does not indicate success: 500 (Internal Server Error - Request was blocked due to exceeding usage of resource 'Concurrency' in namespace 'IPAddress'." ],
    "ExcludeConsoleLog": true
 }

@dotnet/dnceng

Release Note Category

• Feature changes/additions
• Bug fixes
• Internal Infrastructure Improvements

Release Note Description

Additional information about the issue reported

The error is:

error NU1301: Unable to load the service index for source https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-emsdk-b634e009/nuget/v3/index.json. Response status code does not indicate success: 500 (Internal Server Error - Request was blocked due to exceeding usage of resource 'Concurrency' in namespace 'IPAddress'. For more information on why your request was blocked, see the topic "Rate limits" on the Microsoft Web site (https://go.microsoft.com/fwlink/?LinkId=823950). (DevOps Activity ID: 06377538-A80D-4143-AAD2-DB5FE3BC424C)).

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1455317
Error message validated: [error NU1301: Unable to load the service index for source https://pkgs\.dev\.azure\.com/dnceng/public/_packaging/[^/]+/nuget/v3/index\.json\. Response status code does not indicate success: 500 \(Internal Server Error - Request was blocked due to exceeding usage of resource 'Concurrency' in namespace 'IPAddress'\.]
Result validation: ❌ Known issue did not match with the provided build.
Validation performed at: 6/12/2026 9:14:46 AM UTC

Report

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	0

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1455317
Error message validated: [error NU1301: Unable to load the service index for source https://pkgs.dev.azure.com/dnceng/public/_packaging/ Response status code does not indicate success: 500 (Internal Server Error - Request was blocked due to exceeding usage of resource 'Concurrency' in namespace 'IPAddress'.]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 6/12/2026 3:24:57 PM UTC

Report

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	0

Report

Build	Repository	Step Name	Console log	Pull Request
2999244	dotnet-dotnet	Build	Log
1462356	dotnet/maui	Run Integration Tests - Build windows	Log	dotnet/maui#35901
2999169	dotnet-dotnet	Run Tests	Log
1462125	dotnet/maui	Run Integration Tests - AOT	Log	dotnet/maui#33365
1462070	dotnet/sdk	Restore dependencies	Log	dotnet/sdk#54674
2998934	dotnet-dotnet	Run Tests (centOSStreamContainer)	Log
2999162	dotnet-sdk	Build (ubuntu2204DebPkg)	Log
1462073	dotnet/sdk	Build	Log	dotnet/sdk#54750
2999133	dotnet-performance	Run performance job script	Log
1455317	dotnet/runtime	Build product	Log	dotnet/runtime#129150

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	9	10