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Office 365 ProPlus couldn't verify subscription behind proxy

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Hi,

I have installed Office 365 Pro Plus, and it all works well.  Maybe a month after i installed it, the title bar turned red on my office apps saying i had an unlicensed product, and i had another red bar within the apps saying

COULDN'T VERIFY SUBSCRIPTION  Outlook couldn't verify your Office 365 subscription.  Please make sure you're connected to the Internet.

There's a Retry button as well which tries, and I assume fails when I click it.

If I connect my PC directly to the internet then this verification process appears to succeed, as the red bars will go away.  But how do i get it working behind my proxy?  The proxy is set in Internet Options, and we have no problems otherwise.

I have had a look here: http://technet.microsoft.com/library/hh373144.aspx

All the "Office 365 ProPlus URLs" work fine in my browser except sls.microsoft.com (but this doesn't work with a direct internet connection either). 

We have a KMS server in our environment, but as far as I can see Office 365 does not connect to KMS.

Any ideas what else this could be?

Thanks,

Nick.


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