Can’t connect to Google calendar by Calendar Rollup web part.
Please upgrade to Calendar Rollup 2.0 or greater to fix this issue.
If upgrade to Calendar 2.0 or greater can’t help, customer can use the tool below to test the connection to Google calendar:
If this tool can’t connect to Google calendar, either, it’s recommended for users to check their internet connections; If this tool can connect to Google calendar without problem, please contact firstname.lastname@example.org for help.
Applies for: SharePoint 2013, SharePoint 2010, SharePoint 2007