Products: Managed Backup (Web), Microsoft 365 / Google Workspace Backup
Article ID: kb00215Last Modified: 14-May-2026
Backup Storage Not Available (code 3509)
This article is applicable for Microsoft 365 /Google Workspace Backup and relates to Drive and to Calendars.
Situation
A backup of Drive or Calendar fails with the following error message:
Backup storage not available (Code: 3509)...
Cause
The following IP Addresses are not allowlisted:
66.135.24.121
64.176.194.75
149.28.53.30
18.207.50.155
52.6.7.137
Solution
The following IP Addresses should be allowlisted in your Google / Microsoft consoles for our service.
66.135.24.121
64.176.194.75
149.28.53.30
18.207.50.155
52.6.7.137
Refer to the Google / Microsoft Azure Admin console help for instructions on how to do this.