JBoss has decommissioned their Maven 2 repository (about an year ago according to their site) which was available at http://repository.jboss.org/maven2. But many resources out there still refer to this repository, and many people face the following error when they try to use this repository.
Access denied to: http://repository.jboss.org/maven2
This is because JBoss has deactivated this repository and setup a 403 (HTTP Forbidden) error on this URL. After googling for a while, reading through JIRA entries etc., I found this page which pointed to a new repository from JBoss that contains most (if not all) of the artifacts from the previous one. The new repository URL is http://repository.jboss.org/nexus/content/groups/public-jboss/.
It could have been better if JBoss could have given a hint about this in their old repository URL, instead of sending a 403, which gives no clues.
In fact, as the URL indicates, this is a Nexus Maven Repository instance. You can access the Nexus Repository Manager from http://repository.jboss.org/nexus/ which lists all repositories hosted in it.