Unable to authenticate with bitbucket getting Authentication failed

[Ravi Shankar]

I am getting Authentication failed error from SourceTree as well as when I try from Visual Studio 2019 or 2017

On SourceTree it shows following errors
Authentication failed
unable to get secret
unable to receive callback from OAuth service provider
Please try restrarting SourceTree
Failed to listen on prefix 'http://localhost:34106/' because it conflicts with an existing registration on the machine.

On the browser Microsoft Edge it shows the message:

The connection for this site is not secure

localhost sent an invalid response.

• Try running Windows Network Diagnostics.

ERR_SSL_PROTOCOL_ERROR

I am able to connect from a different machine without any issues.  
Any ideas to help me resolve this error?
Thanks

[Joy Bhattacherjee]

Having Exactly the same issue.

fatal: Failed to listen on prefix 'http://localhost:34106/' because it conflicts with an existing registration on the machine.