User with underscore in name

There is such a habrauser @_meowth_, but when you try to get into his profile, FF reports that Firefox can't find the server at _meowth_.habrahabr.ru . The same thing happens when you try to go to his topics from the RSS-feed. The problem is solved quite simply - just correct the link to meowth.habrahabr.ru a little, but its topics are not visible (it feels like a different user). But if we change in the same way a link to its topic received in the RCC, for example _meowth_.habrahabr.ru/blog/57083 to meowth.habrahabr.ru/blog/57083 , then we get exactly the topic that came to the RCC.

Browser ID under which does not work:

• Mozilla / 5.0 (X11; U; Linux i686; en-US; rv: 1.9.0.4pre) Gecko / 2008101311 Firefox / 3.0.4pre (Swiftfox)
• Mozilla / 5.0 (X11; U; Linux i686; en-US; rv: 1.9.0.8) Gecko / 2009032711 Ubuntu / 8.10 (intrepid) Firefox / 3.0.8
• Arora 0.6
• Opera 9.64
• Mozilla / 5.0 (compatible; Konqueror / 4.2; Linux) KHTML / 4.2.2 (like Gecko)

All this from under 8.10