Outlook informed me today that it would like to install updates:
After clicking on "Update now", however, only the following message was displayed:
Unfortunately, that didn't work out.
Unfortunately Office could not be installed. Please make sure that you have an Internet connection and then try the installation again.
Error code: 30180-26
Unfortunately, the Windows Event Viewer did not shed any light on this. However, I have often had problems like this in connection with proxies. In my case, I use the Sophos UTM proxy (Web Protection).
I then came across the following entry in the UTM log:
utm httpproxy[25807]: id=“0001″ severity=“info“ sys=“SecureWeb“ sub=“http“ name=“http access“ action=“pass“ method=“HEAD“ srcip=“XX“ dstip=“104.124.129.26″ user=““ group=““ ad_domain=““ statuscode=“301″ cached=“0″ profile=“REF_HttProContaInterNetwo (Internal)“ filteraction=“REF_DefaultHTTPCFFAction (Default content filter action)“ size=“0″ request=“0xe202d000″ url=“http://officecdn.microsoft.com/pr/492350f6-3a01-4f97-b9c0-c7c6ddf67d60/Office/Data/16.0.7571.2075/stream.x86.x-none.dat“ referer=““ error=““ authtime=“0″ dnstime=“48457″ cattime=“74″ avscantime=“0″ fullreqtime=“97848″ device=“0″ auth=“0″ ua=“OfficeClickToRun“ exceptions=“av,sandbox,ssl,fileextension,size“ category=“9998″ reputation=“unverified“ categoryname=“Uncategorized“
Although the connection has not been blocked, there still seems to be a problem.
Sophos UTM Web Protection already includes an exception for Windows updates:
I have added the following entry to this exception:
http://officecdn.microsoft.com
After the rule was saved, the update could be installed.
I have not been able to determine whether other URLs may need to be included in the exception. Such exceptions probably also help with problems with updates in other firewalls.
If the automatic update does not work, the updates can also be downloaded and installed manually. Here is an overview of the Office updates:
In my case, it was KB3127988 for Outlook 2016 which I was initially unable to install automatically. The update can be downloaded directly here: