IE8 Start Pages not loading

I'm experiencing a problen when starting Internet explorer 8.

Whenever I define a start page that is on the internet, and I start IE8, the "Internet Explorer cannot display the webpage" (see attached file) message is displayed.  Only when I refresh the tab (press F5) the connection is made.

All intranet pages are loaded at IE startup, only the internet sites never load.  I'm assuming that the proxy settings are not loading when IE starts, but that's a guess.

Does anyone know how to allow all pages to load correctly at startup?

Running on a Windows 2003 Server with Proxy server for internet access.  Intranet sites do not require the proxy server.  Proxy settings are configured using a script that is located on the proxy server (PAC Script)

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Justin OwensITIL Problem ManagerCommented:
First place I would look is the proxy server.  Make sure its DNS settings are correct.  It may need to have its cache flushed and rebuilt.

raiERBAuthor Commented:
Proxy and DNS are working fine.  Consider that when I reload the page, the conenction is made without problems and the website is displayed.  It is only not working when IE starts for the first time.

For a more visual explanation, let me try to list the steps:

1. IE8 is started
2. IE loads start pages.  Intranet websites are loaded, Internet websites are not (error above is shown on internet websites)
3. I select a tab where an internet website should be loaded
4. I press F5 (refresh page)
5. Internet website is loaded without problems
I was having a similar issue with IE9 on Win7 64-bit.
I followed some suggestions from MS such as:
-Disabled add-ons
-Reset IE
-Use software rendering instead of GPU
None of these worked.  I even uninstalled and reinstalled IE9 but that didn't help either.

It wasn't until I went under security and disabled Protected Mode that IE started running normally again.

I installed IE9 on 4/7/11 and it started acting poorly on 4/23/11.  I am looking through all the updates I have applied since then to see if that is what changed since I had always run in Protected Mode since the install.

I am not sure if this helps you with IE8 but disabling protected mode in IE9 did the trick for me.
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raiERBAuthor Commented:
Thank you for the info, will look into the deavtivation of protected mode.
raiERBAuthor Commented:
Had to open a case with Microsoft to troubleshoot this and they had a hard time finding the reason.

The problem is one of the third party extensions that prevent the proxy PAC file from loading properly when starting up IE.

This can be tested by creatign a copy of the IE link and adding the ''-extoff" switch.  My IE now loaded all pages properly as it should.


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raiERBAuthor Commented:
Selecting Grade B so that s_prusko gets some credit for pointing out problem with add-ons (although it was a third party extension)
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