If you are using Microsoft To Do and see the message "It looks like a firewall is preventing your data from syncing. Try contacting your admin", this may be due to your network connection. Using a VPN, proxy or firewall could cause issues syncing with To Do.
Please contact your IT Admin to have the following URLs whitelisted:
- *.microsoft.com
- *.msecnd.net
- *.live.com
- graph.windows.net
- graph.microsoft.com
- *.office.com
- *.office.net
- *.office365.com
- static2.sharepointonline.com
- todo-web-endpoint.azureedge.net
- *.microsoftonline.com
- *.microsoft.io
- *.windows.net
- microsoft-my.sharepoint.com
- microsoft.sharepoint.com
- login.microsoftonline.com
and the following ports enabled:
- 443
- 80
- 587
If you are seeing similar login issues with other Office 365 web services, please follow these instructions.