I have a separate stand alone JIRA instance.
In the setup screens on step 4 Setup user management I am getting the following error: This is not a valid url for JIRA 4.3 or later.
I can take URL and put it in the browser on my confluence server and have no problems.
Also note that if I put an invalid user in I get an error on the user, but if I have a valid user I still get the URL error.