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Hi Sam,

 

Were there any changes made on the computer prior to the issue?

 

You might get this error if there is any proxy set on the computer or due to a third party program. Follow these methods to resolve the issue:

 

Method 1:

I would suggest you to follow these steps and check if it helps:

a.     Open Internet Explorer.

b.    Click on Tools and then click Internet options.

c.     Click the Connections tab, and then click LAN settings.

d.    Deselect the option Use a proxy server for your LAN.

e.    Place a check mark on Automatically detect settings.

f.      Click OK twice.

 

You may also refer to the article for additional information:

Change proxy server settings in Internet Explorer

http://windows.microsoft.com/en-in/windows7/change-proxy-server-settings-in-internet-explorer

 

Method 2:

Refer to the article to check if Fiddler is the cause of the issue:

[Fiddler] Fix "The proxy server isn't responding" Problem Caused by Fiddler

http://blogs.msdn.com/b/tfang/archive/2012/07/18/fiddler-fix-quot-the-proxy-server-isn-t-responding-quot-problem-caused-by-fiddler.aspx

 

Let us know if it helps.

Rohit S