"IMPORTANT! Newsgroup Access Update: We are pleased to inform you that we are making the Xbox Live Beta "private" newsgroups truly private. Once security is enabled, you will be asked to enter a password each time you enter the newsgroups. You will find the password under the "Newsgroups" heading in the navigation bar to the left of this page. PLEASE do not share this password with anyone outside of the beta program. In order to keep out those who aren't beta participants, we will be changing the password periodically, so please check back if you are unable to access. As part of this change, you will also need to change your browser's privacy settings to low in order to access the forums. This is a temporary solution, so please hang in there while we work on a more permanent fix to the problem."
Microsoft has started locking all them moochers out.
News source: ieXbeta