If the problem is indeed network related, I'd fire up Fiddler. You can install a Fiddler SSL cert locally to decrypt your SSL connections, it'll play man in the middle quite effectively and should hopefully give you some more intuition as to whether that's the cause of your problem.
Why do you have unit tests hitting outside services? If you have developed service clients that need to be unit tested, you should have mock services for them to run against locally so that your unit tests aren't going down every time there's a remote service failure. They don't need to be full blown services, but they should receive the request and respond with the expected result the service would give when hit by the client.
If your clients are generated by the remote service [i.e. by WSDL], then you shouldn't theoretically need to test those as they're generated by the third party - so you should be unit testing against mock clients.
I'd argue that integration tests with real world 3rd party services should be handled by some reporting system on your build pipeline somewhere and your ops team should be investigating that failure, you shouldn't need to be running them locally on your dev machine.
Why do you have unit tests hitting outside services? If you have developed service clients that need to be unit tested, you should have mock services for them to run against locally so that your unit tests aren't going down every time there's a remote service failure. They don't need to be full blown services, but they should receive the request and respond with the expected result the service would give when hit by the client.
If your clients are generated by the remote service [i.e. by WSDL], then you shouldn't theoretically need to test those as they're generated by the third party - so you should be unit testing against mock clients.
I'd argue that integration tests with real world 3rd party services should be handled by some reporting system on your build pipeline somewhere and your ops team should be investigating that failure, you shouldn't need to be running them locally on your dev machine.