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I use Windows 10 and for the last few days, I face a problem on some website few of them are moz.com, edx.org, coursera etc.

An example image of issue that I am facing

I face the similar problem on my laptop and desktop system which is connected by one Dlink router. I use wifi for laptop and wired connection from the wifi modem to the desktop.

I used mobile 4g internet to check the problematic website are working fine. Is it a router problem?

I did reset and reboot of router both did not help. Firewall checked it is normal.

Sathyajith Bhat
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Krishnan
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  • It's indicative of a slow or 'incomplete' connection. Reboot all your network hardware for starters, then check firewall/antivirus settings. – Tetsujin Sep 10 '17 at 08:07
  • What browser is this? Does it happen with an alternative browser? Could be that some page elements (such as CSS) are being blocked by something like an over-zealous ad blocker. – Darren Sep 10 '17 at 11:05
  • i cross check with all browser, and my two system too. It shows same issues. – Krishnan Sep 10 '17 at 11:24
  • As advised by Tetsujin, i reboot the router but it shows same issues again. should i reset the router? – Krishnan Sep 10 '17 at 11:25

2 Answers2

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Coursera, like many websites, uses a different domain to load resources such as the CSS stylesheets, in their case a CDN from Amazon. For coursera.org, viewing the page source reveals:

<link href="https://d3njjcbhbojbot.cloudfront.net/webapps/builds/front-page/app.ad4352e12e75c33c5276.css" rel="stylesheet">

For moz.com:

<link rel="stylesheet" href="https://d2eeipcrcdle6.cloudfront.net/assets/dist/styles/moz-b259826f.min.css">

Maybe cloudfront.net is having problems in your region, or is blocked somewhere:

You might see some indicator in your browser's location bar (for some browsers, look at the right, not at the left) or developer tools (for IE hit F12 to open those).

Arjan
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  • I Check in all browser in my two system face similar issues. I reboot the router. Not yet do reset. should I ? or any other possibility to fix the issues. – Krishnan Sep 10 '17 at 11:29
  • Did you check the first two bullets? – Arjan Sep 10 '17 at 11:48
  • i shows this error "This site can’t be reached". For second i mean the amazon. I am not really getting how to use it to diagnosis the issues – Krishnan Sep 10 '17 at 11:54
  • See the new 5th bullet. – Arjan Sep 10 '17 at 12:16
  • I just noticed that https://www.edx.org/ is not using Amazon's CloudFront for their stylesheets. So this may not be about cloudfront.net being blocked. You might want to focus on edx.org, like check if https://www.edx.org/sites/default/files/css/css_xE-rWrJf-fncB6ztZfd2huxqgxu4WO-qwma6Xer30m4.css loads directly. – Arjan Sep 10 '17 at 12:28
  • it loaded i could see all codes , i think there is no issues. any suggestion – Krishnan Sep 10 '17 at 12:40
  • Nope, if the direct link for the edx.org CSS works, but https://edx.org does not load properly on multiple machines and in different browsers, then I'm out of ideas and you'll need to dive into understanding the (F12) developer tools to get more details. – Arjan Sep 10 '17 at 12:50
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For the Coursera issue- This is a problem with the local ISP provider(BSNL) in India. They appear to be blocking all outbound traffic to domains like *.cloudfront.net.

The page fails to load its css and hence gets displayed incorrectly. Ask them to stop blocking or switch to an alternate ISP- have verified that the page loads correctly on others.

jay
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