Prompted for credentials for proxy server office14client.microsoft.com when launching an Office 2010 application

Applies to: Microsoft Office 2010 Service Pack 2Excel 2010PowerPoint 2010 More

Symptoms


When you launch an Office 2010 application (such as Excel 2010 or Word 2010), you may be prompted for credentials for a proxy server - office14client.microsoft.com - as shown in this image:



The prompt may repeat after being dismissed.

Cause


This is a known issue with the update described in Knowledge Base article 2956191 .

Resolution


To resolve this issue, please install the update found here: http://www.microsoft.com/en-us/search/result.aspx?q=KB3054875&form=DLC