Why do I receive a 503 error on web?

If you are trying to log in to Microsoft To-Do on https://to-do.microsoft.com and see a 503 error, this could be related to limitations in the local network, possibly happening due to restrictions on a corporate network.

Please contact your IT Admin to make sure none of the following URLs are blocked:

*.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

If you are seeing similar login issues with other Office 365 web services, please follow the instructions here.

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