Error facing error while building solution in tfs azure.

Question

Error facing error while building solution in tfs azure.

Sufiyan Ansari 0

I am facing error while building any .net solution is tfs azure, since 5-may-2025.

Error:

NU1301: Unable to load the service index for source https://api.nuget.org/v3/index.json.

Sometimes this url works in my network. Also while I do use my internet data , sometimes the url works and sometimes not.

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Answer 1

Amit Kharkade 1

Hello Sufiyan Ansari,

Can you confirm if the following checks have been done, or if you can try the steps below to resolve the issue?

Clear your NuGet cache (nuget locals all -clear).
Check for proxy, firewall, and DNS issues.
Test your connectivity and retry the build.

If the issue persists, consider using an internal NuGet source or a mirror.

If you found this information helpful, please click "Upvote" and "Accept Answer" to let us know.

Regards,
Amit Kharkade

Sufiyan Ansari 0 Reputation points

2025-05-08T05:40:43.6133333+00:00

Hello Amit,

I have added nuget local all -clear step in my pipeline. Also there is not issue in proxy, firewall and DNS. If there is issue in network then it should work in my mobile data. This url is working in some mobile data.
Amit Kharkade 1 Reputation point

2025-05-08T06:07:41.1933333+00:00
Sufiyan Ansari,

Can you confirm if the following checks have been done, or if you can try the steps below to resolve the issue?

Ensure the NuGet source URL and package reference are correct.

Verify if there’s any outage in Azure services.

Make sure that the resource you're trying to access (package, blob, or service) is available and exists in the specified location.

If using a private feed or storage, ensure that your authentication credentials are configured properly.

If you continue to have issues, let me know more details about the resource you're trying to access, and I can guide you further.

If you found this information helpful, please click "Upvote" and "Accept Answer" to let us know.

Regards,

Amit Kharkade
Sufiyan Ansari 0 Reputation points

2025-05-08T06:20:39.8133333+00:00
Dear Amit,

Please find following checks below.

Nuget source url and package reference are correct.

There is not outage in Azure services

package are available. Even this url (https://api.nuget.org/v3/index.json.) works sometime in my network. This issue occurred from monday. Before monday every thing was fine

We are not using any private feed.

Regards,

Sufiyan
Amit Kharkade 1 Reputation point

2025-05-08T14:35:28.98+00:00
Recommended actions:

Set up a local NuGet proxy/cache (e.g., BaGet, Artifactory, Azure Artifacts)

Add retry logic in your pipeline (--disable-parallel, --no-cache)

Test TLS/certificate trust with Invoke-WebRequest or curl

Check DNS resolution and routing (nslookup, tracert, traceroute)

Monitor connectivity over time using a script (ping NuGet every minute)

Add fallback NuGet source in NuGet.config

If you found this information helpful, please click "Upvote" and "Accept Answer" to let us know.

Regards,
Amit Kharkade

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Error facing error while building solution in tfs azure.

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