Bug also exists in KB4480976, KB4480967, and KB4480959

Jan 17, 2019 13:31 GMT  ·  By

As I reported earlier today, the latest cumulative updates released by Microsoft for Windows 10 cause an issue when trying to load local web pages in Microsoft Edge.

In updates to the KB pages of each impacted update, Microsoft says that in some cases, installing these cumulative updates leads to the said local websites failing to load or making the browser unresponsive. Here’s how Microsoft describes the bug:

“After installing KB4480973, some users report that they cannot load a webpage in Microsoft Edge using a local IP address. Browsing fails or the webpage may become unresponsive.”

Before anything, it’s important to know that Microsoft has already started working on a fix, but an ETA isn’t available yet.

The company says it will release a patch “in an upcoming release,” which can mean anything from a cumulative update shipping by the end of the month to the next Patch Tuesday cycle coming on February 12.

The glitch has already been confirmed in several cumulative updates, as follows:  

Windows 10 version 1809: January 8, 2019—KB4480116 (OS Build 17763.253)
Windows 10 version 1803: January 15, 2019—KB4480976 (OS Build 17134.556)
Windows 10 version 1803: January 8, 2019—KB4480966 (OS Build 17134.523)
Windows 10 version 1709: January 15, 2019—KB4480967 (OS Build 16299.936)
Windows 10 version 1709: January 8, 2019—KB4480978 (OS Build 16299.904)
Windows 10 version 1703: January 15, 2019—KB4480959 (OS Build 15063.1596)
Windows 10 version 1703: January 8, 2019—KB4480973 (OS Build 15063.1563)

How to fix the issue caused by these cumulative update

The workaround on all affected versions is pretty much the same, so if you installed any of the aforementioned cumulative updates, here’s what you need to do.

As Microsoft explains, the bug happens when users try to load a local page, so you’ll have to add the page that is failing to the trusted sites list.

To do this, launch Control Panel – note that Control Panel is now a second-class citizen on Windows 10, so you need to open it either by clicking the Start menu and typing its name or by typing Control Panel in the File Explorer address bar.

Adding local web pages to the trusted sites list

Next, in Control Panel you need to follow this path:

Control Panel > Network and Internet > Internet Options > Security (tab) In this Security tab, click the Trusted sites icon (the green check mark) and then click the button that reads Sites. You should now see a small screen that lets you add new websites to the zone.

The first thing you need to do, and it’s critical to do this, is to clear the check box next to the option called Require server verification (https:) for all sites in this zone.

Next, you need to enter the address of the local website that failed to load in the field called Add this website to the zone. You have to use the IP address of the page, so it must look something like 10.10.0.1, 192.168.0.1, or any other pattern that you use in your network.

Once you do this, check the Require server verification (https:) for all sites in this zone back. Again, it’s critical that you do this after you add the site to the list.

Adding local web pages to the trusted sites list

At this point, everything should be all set, so click the OK button and then close all windows. Before the changes are applied, you need to restart Microsoft Edge browser, so when launching it once again, the page should load correctly.

A reboot of the system isn’t required, but it is recommended, especially if you don’t see any improvements after making these edits.

Once Microsoft releases a fix, you can safely follow these steps once again and remove the website from the list mentioned above.

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Adding local web pages to the trusted sites listAdding local web pages to the trusted sites list
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