You are going to have to tell us more than that.
What exactly is the error message, what are you trying to connect with, have you checked Jira is running on the machine you are connecting from (it's not remote, as you said localhost), what do the logs say?
You will want to check the Catalina.out and atlassian-jira.log to see what errors are being thrown and go from there. Verify the following:
Let us know what you find.
...It's true that there are projects in Jira; but they are merely a way to cut off issues, to tell them apart from other sections of work and to apply rules that are specific to that team (the schemes)....
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