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DNS issue affecting Amazon and Ebay Only on LAN
I'm looking for some advice/info/knowledge.. I have not found anything concrete in my numerous searches, so please forgive me if in my frustration I overlooked a pertinent thread..
I have been dealing with a frustrating situation, which has only been happening the past 3-4 months.. let me provide some background info so y'all know where I'm coming from.. I'm a business owner, who has decided to handle my own I.T. responsibilities.. I have a pretty good working knowledge of networking, PC's, etc.. I've always tinkered with PC's.. (since the days of the Commodore64) built and re-built PC's, coded/programmed, wrote html/css/websites, graphic design/Photoshop, etc. as a hobby because I've always enjoyed doing these things, and from a knowledge standpoint, I have kept up with the changes and advancements.. When I decided to take on I.T. for my business, I read a couple of networking and A+ books.. I know more than your average joe.. enough to effectively be the "I.T. Guy" for my business, but I'm not a certified pro.. my business consists of 3 main areas - the storefront, my office, and the stock room.. they're all in the same building, but because of the layout of the building and logistics, the 3 main areas are all on the same ISP, but have to be on 3 different LAN's, therefore 3 different routers.
That said, here is the my situation.. ebay.com and amazon.com will not load some of the time.. the message I get regardless of the browser used is:
"This site can't be reached.. [insert URL here] server DNS address could not be reached"
when this "outage" happens, it affects ONLY eBay and Amazon, and ONLY on the PC's/devices on the office LAN, both hardwired and via WIFI.. if I switch my phone's WIFI off, I can load the websites no problem, but not on WIFI during an "outage".. there have never been any issues on the storefront and
stock room LAN's loading these websites during the "outage".. to further complicate things, it seems to happen randomly.. it can happen anywhere from once a week to every day, and can last anywhere from 30 minutes to nearly all day.. there's no rhyme or reason.. eBay and Amazon load fine on the other 2 LAN's, so that eliminates the ISP and the websites being down as the cause (and I would find it hard to believe that Amazon and eBay would be down that often and for that long).. this lead me to believe that it is an issue with the office LAN. My initial thoughts were an issue with the router, an issue with the firewall or security settings blocking these websites for an unknown reason, or a virus.. I don't want to mess around with a new router because of the pain-in-the-rear it is to reconfigure everything, so I pursued
the firewall and virus theories.. I have all but ruled them out as possible causes.. still not thrilled with the process of swapping out the router and have it not be the causative factor, I continued my research.. long story short, I was able to resolve the issue via DNS settings and a bunch of CMD prompts, but it is not a permanent fix.
That said, I understand what DNS is and how it works, but I am unable to wrap my head around WHY it it happening, occurring randomly, with no distinct pattern, and happening ONLY to amazon.com and ebay.com. Hopefully someone can help me understand WHY it is happening only to 2 websites, and HOW to prevent it from happening again. Thanks in advance!
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