Unsynced Commit error

Hi Team,

I am able to successfully commit the changes. But while sync to bitbucket I am getting the below error message.

An error occurred. Detailed message: An error occurred while sending the request.

Below i am providing more details about the system where I am doing the migration.

Windows Server 2012 R2
Visual Studio 2013

15 days back I was able to commit and sync the changes in the local git repository. Today not able to sync the newly tfs-
git local repository to bitbucket and also facing the issue with the sync the changes to the already migrated application
in bitbucket.