Some websites are messed up on my laptop, but only when connected to my home router (wired or wireless)

Hi all,

I have a doozie here.,,, and probably more that I haven't found yet, are messed up when I visit them on my laptop, when connected to my home router (wired or wireless).  It's the same in all browsers (Edge, FF, Chrome).  If I browse to them on my phone (connected to my home WiFi), they are fine.  If I connect my laptop to another WiFi, they are all fine.  If I view the source of the messed up pages, the HTML is sometimes chopped in the middle, or for example on, the page looks completely weird and the HTML has been really screwed up.  It actually looks like it has been tampered with.  If it was malware on my laptop causing this, then surely it would mess it up for all connections?  Wired to my WiFi router makes no difference, still messed up.  I've scanned the laptop using Avira and Malwarebytes, both reported it to be completely clean.  I've updated the WiFi and Ethernet drivers, no difference.  The router firmware is up to date.  I always use a limited Windows account, no admin (unless updating drivers, etc).  I've tried disabling the antivirus, no difference.

I recently updated to Win10, I don't think I had this problem before then (Win 8.1), but I couldn't swear to it.  I definitely didn't always have it, I know that Amazon used to load fine.  I just don't know when it started.  I can't narrow down the problem as it only happens on one laptop, when connected to one router.

Does anyone have any ideas?  This has me stumped.


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JohnBusiness Consultant (Owner)Commented:
I don't know why pages would render differently for different routers. Is your home router old and slow? It may not be keeping up internally. That is one thought.

Look at the DNS in the home router. It may be pointing to an old ISP DNS address that is not functioning properly. Try or as your Primary DNS.

Finally, upgrade the firmware on your home router.
paulc2000Author Commented:
Thanks for your reply.

My router is new and very fast, one of the best as far as I know, Asus AC68U.  The laptop is also new and very fast.

The DNS is set to and

And the router's firmware is up to date.

I can't think what the problem could be...
JohnBusiness Consultant (Owner)Commented:
I use Cisco routers,  but if fast and the firmware is up to date, then I agree that it is probably not the router.

What about:

1. The ISP modem?  Perhaps it should be replaced.
2. Network congestion:  Someone at home downloading big videos?  That could cause your issue. Make sure only one computer is on and test again.
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Mal OsborneAlpha GeekCommented:
Is DNS set to and on the router, or on your laptop?  If it is set on your router, and the laptop points to your router, then try using on the laptop itself. You may have a corrupt DNS entry on the router.
JohnBusiness Consultant (Owner)Commented:
That is what was suggested earlier and the suggested DNS is being used.  Computer should get DNS from router, not set it own.
paulc2000Author Commented:
DNS is set on the router, but I also tried setting it on the laptop, no difference.

No one else is using the connection, and it's a 240 Mbit/s line.  The ISP modem might be an issue, but again, no other device has this problem (phones, another laptop), so I don't think that's it either...
paulc2000Author Commented:
Also, on some sites, eg Amazon, the HTML gets chopped in the middle.  However, on, the HTML actually changes - I've compared the source as it should be, with how it is at home.  The first half (approx) is normal, then it all suddenly goes crazy.  Tags have characters missing or added.  Text, likewise.  It's really very strange.  I can post some of it later, if you'd like to see it.
JohnBusiness Consultant (Owner)Commented:
I think you do need to talk to the ISP and see what is going on. You have reviewed and eliminated most other causes (unless there is something you haven't yet noticed).
paulc2000Author Commented:
I think my ISP will ask if it's the same on all devices, and when I tell them it's not, they'll say it's a problem with the laptop...  Here's a screenshot of the HTML for - on the left is the crazy HTML, on the right is the normal one...  It's all fine as far as line 809, then it goes nuts...  Weird...

HTML screenshots
JohnBusiness Consultant (Owner)Commented:
One way to stick handle around the ISP is to connect your problem computer directly to the ISP modem by Ethernet. Is this a problem?  If so, and since the problem computer is fine elsewhere, then it is an ISP issue.
paulc2000Author Commented:
It's still a problem that way too, but neither my phone nor another laptop have this problem, so I don't think we can conclude that it's the ISP's fault.
JohnBusiness Consultant (Owner)Commented:
Run a TCP/IP reset and see if that fixes the issue.

Open cmd.exe with Run as Administrator
Then  netsh int ip reset c:\resetlog.txt
Also, ipconfig /flushdns followed by net stop dnscache followed by net start dnscache
Then restart the computer
paulc2000Author Commented:
Just ran those commands, and restarted.  No difference.  Sorry :(
JohnBusiness Consultant (Owner)Commented:
I am not sure what is wrong with your computer at this point.

Try removing IE and adding it back.

Go to Control Panel, Programs and Features, Windows Features. and uncheck IE. This forces a restart. Do the restart. Got back and add IE back in. Restart again.

Now do a Full Reset of IE. IE, Tools, Internet Options, Advanced and Reset. Do both top and bottom half (removes passwords). The first remove / re-add should also delete cookies. but you can also delete cookies and temporary files.
paulc2000Author Commented:
Actually, I just cleared my FF cache, and loads normally now!  However, still doesn't render at all in any browser.  It loads plenty of HTML, but nothing shows on screen.  Weirder and weirder!
paulc2000Author Commented:
Correction: Amazon now loads in IE and Edge, but not FF or Chrome.
JohnBusiness Consultant (Owner)Commented:
On the problem computer, make a new, test Windows User Profile (Account). Log into the new Windows Account and try browsing in the new account. You may have profile corruption.
paulc2000Author Commented:
I made a brand new Windows user profile, logged in, but still Amazon shows a blank page.
JohnBusiness Consultant (Owner)Commented:
At this point, since other computers work (be sure of that), I think you are at the point of backing up your system, formatting and reinstalling Windows. I do not know of any other practical course of action.
paulc2000Author Commented:
Many thanks for your help.  I will live with the inconvenience, reinstalling Windows without a guarantee of success is not worth it for me.  Interestingly, and similar to being able to connect on other WiFi networks, if I connect to a VPN, all is well again.  As soon as I disconnect, Amazon won't load.

I am willing to close this question, but I am unsure of how to award points, mark as resolved etc.  What's the protocol in such cases?  Thanks.
JohnBusiness Consultant (Owner)Commented:
If we have not helped, you can delete the question. If you feel I have offered assistance you can accept your above post as answer and provide assistance points.  About the only thing you cannot do here is say you solved it (because the issue remains outstanding).
paulc2000Author Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for paulc2000's comment #a40984314
Assisted answer: 500 points for thinkpads_user's comment #a40984324

for the following reason:

My own solution is not satisfactory, but I feel it is the only reasonable one at this point.  John Hurst provided prompt and useful suggestions, unfortunately, they did not work, but I believe his effort is well worth the points.
JohnBusiness Consultant (Owner)Commented:
@paulc2000 - Thanks.
95% chance that the problem is - MTU mismatch. Can you check the documentation of you router and see if you can adjust MTU setting on the router?

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paulc2000Author Commented:

Brilliant - thank you very much!!  All my interfaces on the laptop were set to 1500.  I checked the router, it was set to 1492, it would not allow me to increase it, so I changed the MTU on my laptop to 1492, and voila - the pages loaded correctly once again.  Thank you very much.
paulc2000Author Commented:
Adjusting the MTU on the laptop fixed the problem, many thanks to AlexBlinov.  I will attempt to reassign the points...
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