I get below error when I test settings in Reposiroty:

Unable to fetch from remote repository:
https://userName@bitbucket.org/path/to/repository.git - [error: The requested URL returned error: 401 while accessing https://userName:XXXX@bitbucket.org/path/to/reposiroty.git, , fatal: HTTP request failed]

Using "password over http(s)" Authentication Style.
I tried with couple of user names and it throws the same error each time.
I also cross checked by direct repository access over web and from console and it works.

I have cross-checked the connectivity with bitbucket using telnet bitbucket.org 443 and I am getting connected.

I noticed this issue when users were no longer able to see source code,reviews and commits for any recent issue in JIRA

Access was working fine before couple of days!!