Thank you for taking the time to report this bug and help to improve Ubuntu.
This problem was caused by a regression in the hal package, which was previously reported and has been fixed in hal 0.5.11~rc2-1ubuntu2 in the archive.
The network-manager package should eventually be updated to not rely on deprecated hal interfaces, but for hardy this issue is now resolved.
Thank you for taking the time to report this bug and help to improve Ubuntu.
This problem was caused by a regression in the hal package, which was previously reported and has been fixed in hal 0.5.11~rc2-1ubuntu2 in the archive.
The network-manager package should eventually be updated to not rely on deprecated hal interfaces, but for hardy this issue is now resolved.