Firewall restrictions can cause the failure of CC4 Microsoft® 365 Apps product installation and further Office updates.

Please follow the relevant procedure below to add the exceptions into the firewall equipment.

Sophos Firewall
Sophos has released a list of exclusions in KB 132291, please refer this link, that are required in their devices to allow unrestricted access to Office 365 source files. These should be added to the firewall's exceptions list.

SmoothWall
Follow the steps given below to add the exceptions in Smoothwall:

1. Log on to your 'Smoothwall Filter & Firewall Admin' user interface.
2. Navigate to Guardian, Policy Objects, Categories.
3. Under Manage Categories, enter the name for the new category.
4. Add the domains/URLs from the text file 'microsoft_365_apps_firewall_exceptions_list.txt' available in the Download section below.
5. At the bottom of the Manage Categories field, click Save to create the new category.
6. In the WEB PROXY menu, under the Authentication submenu, click Exceptions.
7. In 'Available categories or category groups', search and select the new category that you created in step 3 above.
8. Click Add.
9. Click Save to create the exception.

Other firewall/proxy devices
The list of domains/URLs from the text file 'microsoft_365_apps_firewall_exceptions_list.txt' in the Download section below need to be added to the exception list for the firewall device by following relevant device-specific steps.

• In Microsoft Edge:

1. Right-click the disk icon and select 'Open link in new tab'.
2. You can see the list in a new tab.
• In Google Chrome:
1. Right-click the disk icon and select 'Save link as'.
2. When the Save As window is displayed and prompts for a location to save the download to, browse to the folder where you want to save it and click Save.
3. When the download has finished and appears at the bottom of the screen, click the arrow alongside it and select Open.