Unable to clone/pull a bitbucket git repo

[NerdyLuffy]

fatal: unable to access 'https://NerdyLuffy@bitbucket.org/abc/cde.git/': GnuTLS recv error (-110): The TLS connection was non-properly terminated.

[Nic Brough -Adaptavist-]

That means the client or server is using software that does not support the TLS protocol the other one was asking for.

Bitbucket supports all standard TLS protocols, and has, of course, had the two insecure ones removed, so my guess is your client is trying to use the wrong ones.  Get the client fixed and you should be fine.