What error message are you getting into your logs?
Is there some firewall blocking the communication? The credentials and address are correct on JIRA Configuration?
These two links might be useful for you:
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
We're bringing product updates and pro tips on teamwork to ten cities around the world.Save your spot