We too are experiencing this issue, with Maven 2.2.1 on a new Linux build server in our environment. Our main Linux build server (same configuration as far as we can tell) does not experience the issue, nor have we seen the issue on Windows developer environments we use.
We have an EAR build that usually takes about 47 seconds to complete on unaffected servers. When affected by this issue, the build time increases to nearly 8 minutes.
The site goal starts normally, then we get a 3 minute and 13 second delay on one of our modules, followed by (not sure this is related):
build 06-Oct-2009 14:27:36 [WARNING] The repository url 'https:is invalid - Repository 'java.net' will be blacklisted.
and then a LOT of the following messages for dozens of repositories, taking up almost another 3 minutes of the site generation for the different modules in our EAR build.
build 06-Oct-2009 14:27:43 [DEBUG] Using Wagon implementation lightweight from default mapping for protocol http
build 06-Oct-2009 14:27:43 [DEBUG] Checking for pre-existing User-Agent configuration.
build 06-Oct-2009 14:27:43 [DEBUG] Adding User-Agent configuration.
build 06-Oct-2009 14:27:43 http:build 06-Oct-2009 14:27:43 http:build 06-Oct-2009 14:27:43 http:...
Manually setting the version of the maven-project-info-reports-plugin to version 2.0.1 works around the issue for us too.
Our Maven install is basic with no mirrors or artifactory configurations. We are behind a corporate proxy that is configured in settings.xml.