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Just this weekend I no longer can access my company's websites. Even their email system which I use a client and via a different port number stopped working. I first thought their systems were down. However, that was not the case. When I changed my DNS settings to not use Internet Guide and just back to my default ISP DNS, everything worked fine. Switched back to Internet Guide and all stopped. Anyone know if there was a recent change to their system? I tried whitelisting the company's domain but that didn't do anything. Also, I'm not sure why the email would be blocked as that doesn't even use ports 80 & 443.
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. 220.127.116.11 Only if this returns a DynDNS IP address like 18.104.22.168, it is blocked by Internet Guide. Check with another recursive DNS service: nslookup example.com. 22.214.171.124 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.