What’s going on here??? Really Weird DNS Resolving Issue???

  • I really could use advice from anyone with Networking, DNS or DNS related experience. I believe this to be the issue (although I’m not certain).

    -pfSense 2.3.1-RELEASE-p5 (i386) FreeBSD 10.3-RELEASE-p3.
    -Time Warner Cable (TWC) supplied router Arris TG1672G in bridge mode.
    -Netgear Router Nighthawk X6 R8000, again in bridged mode and only using wireless features. I use 4 of the available ports to connect other devices (laptop, printer, local server).

    I can not connect to certain domains, which coincidentally belong to a off-site physical server running linux centos. I can access the internet and browse a number of other public websites. I can successfully connect to the plesk control panel on the server, however I cannot connect to any website that resides within it. Really weird.

    -Verified that the domains are working. They can be accessed from a cell phone using the providers data rather than my wireless network.
    -Reset the cache in Safari, Mozilla.
    -Reset the cache in pfSense.
    -Reset and factor reset numerous times the TWC router, pfSense router, and the NetGear Nighthawk.
    -Performed ping test from laptop using Terminal on Mac and all tests returned successful.
    -Removed all pieces of hardware then connected laptop directly to TWC router and was SUCCESSFUL in connecting to the domains in question.

    The system had been working correctly up until last week. The only change that was made was that I upgraded the pfSense to v 2.3.1. Prior to upgrade I had the version that did not have the new GUI design. Could this be the reason? If so, how to roll back changes to confirm or deny this hypothesis?

    I think this might be related to a DNS issue. Although, truth be told, I’m not at all experienced enough to understand the technical details of how DNS works.

    I have SSH access to pfSense as well as the GUI.

    Please help as this situation is really frustrating…any ideas would be greatly appreciated!!

  • Is it really an issue with resolving DNS? If you try to ping the site by hostname, what's the result?

  • I can ping all the sites successfully.

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