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For some reason only Meta SE is displaying correctly in my Internet browsers.

Screenshot of Stack Overflow:

Stack Overflow ScreenShot

The same occurs with Code Review, Music Practice and Theory and Super User.

I don't understand all the working of website sites, etc. Can anyone give me a hint as to why this is happening?

I normally use Chrome, current version Version 48.0.2564.82 m.

  • are you using any browser plugins? are you behind a corporate firewall? – Sklivvz Jan 21 '16 at 11:23
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    what do you see here: cdn.sstatic.net/stackoverflow/all.css?v=d9e4e43243243242 – Sklivvz Jan 21 '16 at 11:25
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    Error Code: 502 Proxy Error. Forefront TMG denied the specified Uniform Resource Locator (URL). (12202). IP Address: 172.17.94.40 Date: 2016/01/21 11:26:32 AM [GMT] Server: MWPTMG01.elec.eskom.co.za Source: proxy – Jean-Pierre Oosthuizen Jan 21 '16 at 11:28
  • @Sklivvz Thats the Info for support personal. There will be a corperate firewall. Plugins Adobe Flash Player - Version: 20.0.0.286, Native Client, Chrome PDF Viewer, Widevine Content Decryption Module – Jean-Pierre Oosthuizen Jan 21 '16 at 11:29
  • Forefront TMG denied the specified Uniform Resource Locator (URL). Tell Forefront to GFH (or is it GFI?) – Won't Jan 21 '16 at 14:50
  • It was actually working a bit this afternoon but stopped after a period of time again – Jean-Pierre Oosthuizen Jan 21 '16 at 14:52
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Our sites are served through two main locations:

  • the actual websites at (e.g.) stackoverflow.com which contain only the text of the pages
  • a static resource website at http://cdn.sstatic.net/ which contains images, style, and other resources.

This is an optimization due to the way browsers work.

Apparently you are behind a misconfigured firewall which is letting through the first website but blocking the second website.

You can see that this is the case in this error you reported:

Error Code: 502 Proxy Error. Forefront TMG denied the specified Uniform Resource Locator (URL). (12202). IP Address: 172.17.94.40 Date: 2016/01/21 11:26:32 AM [GMT] Server: MWPTMG01.elec.eskom.co.za Source: proxy

You need to ask your internal support to allow connections to *.sstatic.net on HTTP and HTTPS ports in the "Forefront TMG" instance running on MWPTMG01.elec.eskom.co.za.

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