Certain PCs unable to view a particular website

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  Hello all,

  This is my first post here, pardon me if I am posting at the wrong forum.

  I have a weird problem here in my workplace.

  My workplace hosts its own website. Eg: www.abc.org.sg 
  I am able to use PC A to access www.abc.org.sg but I am unable to access the same website, www.abc.org.sg using PC B.
  This happens to like a few PCs in my workplace.

  Public ip of www.abc.org.sg : 203.125.50.xxx
  Internal IP of the webserver hosting www.abc.org.sg : 192.168.10.3
  I have a watchguard firewall doing a NAT from public to internal

  Has anyone come across the same problem before?

  Rgds,
  Johnson

  Tuesday, June 22, 2010 7:50 AM