I can confirm that
http://www.icao.int/ works for me too, also 15th Aug about 1930Z. Wanted to download PDF's for ICAO Annexes 1-18 as reference documents but couldn't find any such files - only 'pay for' services. Can't believe that these documents are not more readily available for public viewing - I can't be looking in the right place! Anyway my whinge aside the website does seem to be fully functional and accessible.