xxxxxxxxxx
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
Invoke-WebRequest -Uri https://apod.nasa.gov/apod/
xxxxxxxxxx
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls, [Net.SecurityProtocolType]::Tls11, [Net.SecurityProtocolType]::Tls12, [Net.SecurityProtocolType]::Ssl3
[Net.ServicePointManager]::SecurityProtocol = "Tls, Tls11, Tls12, Ssl3"