This was an issue I faced while working Field Service Demo data for exam preparation.

Field Service Demo data is provided as part of training which can be used to understand the functionality. Package Deployer tool was provided to import few customizations and some data into CRM organisation. However, When I tried to run this tool it failed with an error message “Unable to connect to organisation”.

To resolve this, I need to add couple of registry entries in my machine.

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft.NETFramework\v4.0.30319] “SchUseStrongCrypto”=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft.NETFramework\v4.0.30319] “SchUseStrongCrypto”=dword:00000001

Once I added these entries, it was a smooth execution.

Hope this helps.