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The error message TF31002 in Visual Studio 2017 signifies that the application was unable to connect to the Team Foundation Server (TFS). This error occurs when there is an issue with the connection settings or configurations of the TFS.

There are several reasons that can cause this error message to occur, including:

• Incorrect credentials: If the login credentials provided are incorrect, the connection will not be established.

• Invalid TFS URL: If the URL for the TFS is incorrect, Visual Studio will not be able to connect to the TFS.

• Network connectivity issues: If there is a problem with the network connectivity, Visual Studio will not be able to establish a connection to the TFS.

To resolve the TF31002 error message in Visual Studio 2017, you can try the following solutions:

1. Verify Credentials: Ensure that the credentials entered are valid and have the necessary permissions to access the TFS.

2. Check TFS URL: Confirm that the URL provided in the connect dialog box is correct.

3. Check Network Connection: Check the network connection and verify that it is stable and not blocking the connection.

4. Restart Visual Studio: Try restarting Visual Studio to see if the issue is resolved.

5. Clear Cached Data: Go to Control Panel -> Credential Manager -> Windows Credentials and remove any cached TFS credentials.

6. Refresh the Connection: Click on the Refresh button in the Team Explorer window to refresh the connection.

7. Repair Visual Studio: If none of the above steps work, try repairing Visual Studio from the Control Panel.

If these solutions do not work, you may need to contact your administrator or Microsoft support for further assistance.