When a jira-report is configured to run against a private Jira installation that requires login credentials, if a user's password contains non URL-friendly characters, Jira authentication fails.
For example my Jira user's password is:
With this password Jira authentication fails.
As a workaround I can use:
i.e. with the "#" URL-encoded and in this case, authentication works fine and the jira-report is produced.
I suppose here that the password is included in the Jira Download of issues URL.