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did you whitlist the google appls list of servers? 
 
 
Help CenterCommunity 
Google Workspace Admin 
Advanced Gmail managementGmail firewall settings 
Gmail firewall settings 
As an administrator, set up your firewall to ensure users in your organization have access to Gmail. 
 
Make sure your firewall rules connect to the following supported hosts and ports. Otherwise, users might be blocked or denied access from Gmail features. The asterisk (*) is a wild card, representing any value except a period.. 
 
These hosts and routes should be whitelisted in your firewall rules even if you turn off the corresponding service in the Admin console. Gmail uses these hosts and routes to communicate with other Google Workspace and Google services. 
 
The asterisk (*) is a wild card, and represents any value except a period. 
 
*.client-channel.google.com 
accounts.google.com 
apis.google.com 
clients*.google.com 
contacts.google.com 
hangouts.google.com 
*.googleusercontent.com 
mail.google.com 
ssl.gstatic.com 
<a href="http://www.google.com" rel="ugc">www.google.com</a> 
<a href="http://www.gstatic.com" rel="ugc">www.gstatic.com</a> 
ogs.google.com 
play.google.com
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matedwards

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Thanks ever so much, David. We have whitelisted some of those URL's but not all. Adding your suggestions now. Will let you know. Thanks again Mat
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We have installed a Barracuda Web Security Gateway 610 appliance and can no longer get to Google G-Suite. We have entered G-Suite in the Allowed whitelist. The logs show traffic as 'allowed' from any user/computer &nbsp;but then an 'insecure ssl error' is returned and <a rel="ugc nofollow" target="_blank">docs.google.com</a> is does not rendered. We are&nbsp;not doing SSL Inspection. Any help would be greatly appreciated? Mat 
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We have installed a Barracuda Web Security Gateway 610 appliance and can no longer get to Google G-Suite.
We have entered G-Suite in the Allowed whitelist. The logs show traffic as 'allowed' from any user/computer  but then an 'insecure ssl error' is returned and
docs.google.com
is does not rendered.
We are
 not
doing SSL Inspection.
Any help would be greatly appreciated?
Mat

Barracuda Web Gateway with Google problems.

web filter

Google is an American multinational technology company specializing in Internet-related services and products that include online advertising technologies, search, cloud computing, software, and hardware.