It shows this error:
This is what it says - you've given it a url that does not reply when Jira is poking it.
Can you reach the url in your browser?
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Ok, great, what do you get in the browser? Is it a login or front-end page for an application? (And is it an Atlassian application?)
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So, we need to know why Cloud is unable to reach the server. Could it be firewalled off from the internet?
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