I am getting the following error while pushing to my code bitbucket. It is using .ssh and it worked perfectly earlier and suddenly following error occurred.
$ git push origin branch-name
Connection reset by 18.205.93.1 port 22
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
Assuming your access to that repository hasn't changed, and assuming nothing has changed in your network (such as a proxy server change), this looks most like an ssh-agent issue. You can see more detail of the attempted connection by running GIT_SSH_COMMAND="ssh -v" git push origin branch-name, or you can test your connection and key with ssh -Tv git@bitbucket.org. Both commands should include lines like these:
debug1: Server host key: ssh-rsa
SHA256:zzXQOXSRBEiUtuE8AikJYKwbHaxvSc0ojez9YXaGp1A
debug1: Offering public key: (key type, fingerprint, and path go here)
debug1: Server accepts key: (details about the accepted key go here)
debug1: Authentication succeeded (publickey).
Authenticated to bitbucket.org ([18.205.93.1]:22).
(There will be other lines. Just look for these specific ones. You may also see a SHA1 fingerprint for the host key, if that's what your system prefers; that will be listed as 97:8c:1b:f2:6f:14:6b:5c:3b:ec:aa:46:46:74:7c:40. If you don't see one of those host keys, then you're probably not actually getting to Bitbucket.)
You should also be able to run ssh-add -L and see the key you want to use for Bitbucket.
If your key is not listed in any output, then you can add it with ssh-add /path/to/key. You can also add that key's path as the IdentityFile in your ~/.ssh/config so that SSH always uses that key for that host:
Host bitbucket.org
IdentityFile /path/to/key
