Proxy credentials while opening any Office application

Question

If I open Excel, Word or other Office applications a window for a proxy authentication pops up (three times) trying to connect to

• office15client.microsoft.com

I am using Microsoft Office Professional 2013 behind company proxy and firewall in a domain etc.

What I tried so far:

• Privacy options in the application (checking, unchecking boxes)
• Set the value of UseOnlineContent in the registry to 0
• Other not successful tips from the first 25 pages in Google

What I won't try:

• let the URL through the proxy, even though I am not using anything Internet related in the application and even unchecked multiple boxes to not connect to the Internet.

Yes, I am able to just login with my authentication, but it will ask me again every time I reopen Office or restart the computer.

Any tips or ideas would be appreciated.

Answer 1

For Google Users:
Patches that need to be uninstalled for solving the problem are
KB 3054853
KB 3054925
worked so far for me.

Answer 2

Elegant solution can be redirect office15client.microsoft.com to localhost.

Risk for this solution is that can be confusing if you would like use this functionality in future. There is high chance that you forgot on redirection.

How to do this for Windows 7 and Windows Vista:

1. Click Start > All Programs > Accessories.
2. Right-click Notepad and select Run as administrator.
3. Click Continue on the Windows needs your permission UAC window.
4. When Notepad opens, click File > Open.
5. In the File name field, type C:\Windows\System32\Drivers\etc\hosts.
6. Click Open.
7. Insert row: 127.0.0.1 office15client.microsoft.com
8. Click File > Save to save your changes
9. Save and exit.
10. Restart Microsoft Word

Howto edit hosts for other systems