Link on W3C web site is broken

http://www.w3.org/TR/xhtml1/#dtds, in section A.1.3. XNTML-1.0-Transitional has a link DTD/xhtml1-transitional.dtd that should take you to http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd.  When I click on the link to take me to that page I get
Network Error (tcp_error) 

A communication error occurred: "" The Web Server may be down, too busy, or experiencing other problems preventing it from responding to requests. You may wish to try again at a later time. 
For assistance, contact your network support team.

Your request was categorized by Blue Coat Web Filter as 'Computers/Internet'. 
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This has persisted for several days.  Is the xhtml1-transitional.dtd document not available on your web site?
 
Thanks,
 
Donald Holliday
Donald.Holliday@LexisNexis.com
(719) 481-7399