I'm using Allow-Only mode and some websites don't display correctly

Introduction

When using Allow-Only mode content may not display correctly on websites on the Allow list. Since you're using Allow-Only mode on your networks, you may run into websites that reference other blocked/non-allow listed domains for certain website resources, like images and stylesheets. For example, images may not display properly, you may only see text on the web page and interactive content may not function.

Solution

There are a few different methods you can use to figure out which non-allow listed domains are being referenced when loading a website on your network's allow list.

Using Mozilla Firefox

• On a computer that is not using Cisco Umbrella use the Web Developers Console option in Firefox.
1. Select the menu icon at the top-right of your browser window, click the wrench icon labeled 'Developer' then select 'Toggle Tools'
2. With the console open, load the website and select the Network tab and it will list all of the domains required to load a web page.
3. Add all of the domains listed in the console to your allow list.

Using Google Chrome

• On a computer that is not using Cisco Umbrella use Chrome Developer Tools in Chrome.
1. Select the Chrome menu at the top-right of your browser window, then select Tools > Developer Tools. Or right-click on any page element and select Inspect Element.
2. In the console, click the Network tab.
3. Select the reload page button with the console open.Typically you will see a red entry that has a corresponding column showing which URL was called and failed. You can then add these domains to your allow list. 

Reviewing your Activity Search

• Another option is to examine your Activity Search on the Umbrella Dashboard to see which domains are being blocked that are related to the web page you are trying to view. Add any relevant domains to the Allow list as needed.

Using WebPageTest.Org

• On any computer or device with internet access
1. On the Test a website's performance page, enter in the URL of the site and select Start Test
2. Once the page has completed it's runs, it will take you to the Test Results screen
3. Find the bar that states "Summary - Details - Performance Review - Content Breakdown - Domains" etc, and select Domains
4. From here you will be able to see the additional domains that load whenever the target site is loading
5. The Domains page can be utilized to find additional sites that may need to be whitelisted for the page to load