Please make sure your CNAME record points to n2.nabble.com. Yesterday the database disk of that server crashed and we had to restore the service on another machine (no data was lost). So the CNAME record must point to n2.nabble.com so that it can follow our DNS changes.
For now, I reset the domain name of your forum, so you can find it here:
http://artifactory.2380776.n2.nabble.com/Feel free to set the domain name again.
Please let us know if you still have issues.