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Answer by RotBlitz · Jun 19, 2011 at 10:09 PM
DNS in general (and therefore Internet Guide in particular) are nothing to do with ports, but with name resolution only. That said, you are able to find out if it is really Internet Guide blocking domains without even configuring Internet Guide.
Check with Internet Guide:
nslookup example.com. 22.214.171.124
Only if this returns a DynDNS IP address like 126.96.36.199, it is blocked by Internet Guide.
Check with another recursive DNS service:
nslookup example.com. 188.8.131.52
If it is blocked by Internet Guide, then this should return a different address than with Internet Guide.
Also, if you're using a VPN to reach your company's network, you must disable the landing page in your defense plan to get NXDOMAIN results instead. And in order your defense plan to take effect, you must keep the hostname associated with your defense plan updated with your current IP address information.
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