Trying to clone: Failed connect to bitbucket.org:443; Operation now in progress

[Deleted user]

I recently received a small RedHad 7.6 linux machine (no GUI) to run my code on.
When trying to clone my repo:
git clone https://someone@something.org/somegroup/myrepo.git
... I expected a log in prompt. Instead, I got:

unable to access 'https://someone@something.org/somegroup/myrepo.git/': Failed connect to bitbucket.org:443; Operation now in progress

Why is the connection failing?
Also, what operation is "now in progress"?

[Michael Kimathi _AC Nairobi_ Kenya_]

Hello Tudor,

On behalf of Atlassian Community Events, Nairobi we are answering this question as part of answerers challenge at our virtual event. 

This seems to be a firewall issue/error, therefore you can find your solution on this link as the other user who faced the same issue: https://community.atlassian.com/t5/Bitbucket-questions/Failed-connect-to-bitbucket-org-443-Operation-now-in-progress/qaq-p/135885

Best Regards

MK

[Deleted user]

I don't see how this is an answer to my problem.

1. How were you able to determine that this is a firewall issue? I had googled the same link as the one you provided a week ago but it doesn't actually include any reference to the error I am getting.
2. What in my error exactly tells you this is a firewall issue and not, for example, a network reachability issue, pubic key validity or SSH agent version?
3. What about that "Operation now in progress"? What is the operation in progress?