Symptoms

Office 365 application endpoint upgrade fails with the following error:

Trying to detect SQL Server connection string from existing configuration...
Failed to detect the SQL Server connection.
Please, specify database connection parameters explicitly

Cause

This Upgrade instructions step was skipped:

Unblock the content of the O365-Web.zip file. To do this, right-click the file in Windows Explorer, click Properties, click Unblock, click OK.

Resolution

Unblock folder content, check directory permissions and navigate to the deployment folder, right-click the Deployment.dll file, select Properties context menu item and click Unblock.

Internal content