Cannot use JIRA for User Management during Installation - process hangs and will not continue

Steps to Reproduce

1. Install Confluence 4.3.3
2. Run through the setup wizard and select JIRA for User Management
3. Enter your JIRA server credentials
4. The page will not move forward, the next button is greyed out, and you will see this error in the logs:

   2012-11-23 16:06:17,232 ERROR [Long running task: Synchronising JIRA Directory] [confluence.setup.actions.ConnectToJiraSyncDirectoryAction$SyncJiraDirectoryLongRunningTask] doInTransactionWithoutResult User <admin> does not exist
    -- referer: http://localhost:10433/setup/connecttojirasyncdirectory-start.action | url: /setup/connecttojirasyncdirectory-start.action | userName: anonymous | action: connecttojirasyncdirectory-start
   com.atlassian.crowd.exception.UserNotFoundException: User <admin> does not exist
   

   where <admin> is the admin user in JIRA, and does exist.

See the attached log for the full stack trace and errors.

NB: A similar error occurred in Confluence 4.3.2, but the error in the logs is this:

2012-11-23 16:26:32,309 ERROR [http-10432-1] [atlassian.confluence.servlet.ConfluenceServletDispatcher] sendError Could not execute action
 -- referer: http://localhost:10432/setup/connecttojira-start.action | url: /setup/connecttojirasyncdirectory-start.action | userName: anonymous
java.lang.NullPointerException
        at com.atlassian.confluence.setup.actions.ConnectToJiraSyncDirectoryAction.getInternalDirectoryId(ConnectToJiraSyncDirectoryAction.java:81)

Sometimes there is no error, but the page hangs at

The last line in the logs is:

2012-11-23 17:33:57,401 INFO [Long running task: Synchronising JIRA Directory] [atlassian.crowd.directory.DbCachingRemoteChangeOperations] findGroupsToUpdate scanned and compared [ 42 ] groups for update in DB cache in [ 6ms ]

Again see the attached 4.3.2 log for full error and stack trace.

Workaround

1. Clean the Confluence install by backing up and removing the contents of <confluence-home>, and backing up the database.
2. Run the installation again
3. Select to Continue and Overwrite Existing Data in the database, and continue
4. Instead of choosing JIRA for User Management, select to Manage Users and Groups Within Confluence
5. Create an admin account
6. Once you are into Confluence, set up JIRA as a User Directory by following these instructions