Use the IPVersion property to specify Internet Protocol Version. The default value is ivIPv4.
property IPVersion: TIPVersion;
Use the IPVersion property to specify Internet Protocol Version.
Supported values:
Note : When the TIPVersion property is set to ivIPBoth, a connection attempt will be made via IPv6 if it is enabled on the operating system. If the connection attempt fails, a new connection attempt will be made via IPv4.