If the nbs.cn is UP but you cant access the page, try one of the below solutions:
Browser Related Problems
Force a full refresh web page. This can be done by pressing CTRL + F5 keys at the same time, It works on your favourite browser (Internet Explorer,Firefox, Chrome etc.).
Clear the temporary cache and cookies on your browser to make sure that you have the most recent version of the nbs.cn.
Still not resolved? Try to Fix DNS Problems
Clear your local DNS cache to make sure that you grab the most recent cache that your ISP has. For Windows - (Start > Command Prompt > type "ipconfig /flushdns" and hit enter).
You may try to use an alternative DNS service other than your ISPs. OpenDNS or Google Public DNS are both excellent and free public DNS services. If your ISP has blocked nbs.cn than you can access Nbs by using alternative DNS service
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