Certain web pages won't display website on all browsers and all computers on home network

There are two computers on the home network that will display random website such homedepot.com.   We all sorts of malware scans but did not find any related issues.  We all change the DNS on both the router and  checked the local NIC.  It's a sonicwall router.  Any suggestions?
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snoopaloopAsked:
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snoopaloopAuthor Commented:
I swapped routers and discovered that ATT wanted to change PPPOE password.  Old school... yes, I know. Connectivity to all sites worked fine as soon as they provided me with the new password.
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jcimarronCommented:
snoopaloop--
So you cannot reach http://www.homedepot.com/ but all other websites can be visited?
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snoopaloopAuthor Commented:
That site and a couple other websites I can't recall
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tailoreddigitalCommented:
I wonder if a ipconfig /flushdns from the command prompt would resolve this?

FYI,
https://www.whatsmydns.net/flush-dns.html
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snoopaloopAuthor Commented:
Negative.  I've already tried that.
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jcimarronCommented:
snoopaloop--
Look into your HOSTS file to see if homedepot.com (and the other unreachable sites) is in there.

What browser do you use?  Try another (Firefox, Chrome, IE, etc.)
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snoopaloopAuthor Commented:
Hi!  I'm on-site now with my laptop.   Home Depot website now does not work since I've connected to their wifi.  Heck, Experts-exchange was having problems too.   I'm using my MiFi hotspot to write.  Anyway, everything points back to the sonicwall.  Though, I'm not sure what could have caused this after already making the DNS adjustments.
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tailoreddigitalCommented:
If you us a ping -t google.com,   do you get a consistent ping?

If the ping is inconsistent, how old is the router?   What's the distance to the router?  Have you tried another channel for the wireless?
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tailoreddigitalCommented:
If the PPPOE password was wrong then no sites would connect.    It sounds like you had a flaking out/failing router.   Congrats on the fix.
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snoopaloopAuthor Commented:
One would think, right?   Router has been fine ever since.
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snoopaloopAuthor Commented:
My solution fixed the problem
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