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 More tools option, then select Web Developer 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.
4. Note: You may have to select the Pause option to enable you to scroll through and observe the listed domains

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. Documentation on how to view your Activity Search can be found here: Activity Search Report

Using WebPageTest.Org

• On any computer or device with internet access
  
  1. Navigate to webpagetest.org 
  2. Ensure that the Site Performance option is selected. Then input the URL of the site to check, select the appropriate Desktop option, and then Start Test.
  3. Wait for the testing to complete
  4. Once Testing is completed, change the View to the Domains section 
  5. From here you will be able to see the additional domains that load whenever the target site is loading
  6. The Domains page can be utilized to find additional sites that may need to be allowed for the page to load. Note: Domain dependencies are usually the the first 1-3 domains in this listing.