Internet Direct (Indy) Version 9.0.2 Beta
TIdTunnelMaster.LockDestinationHost
Indicates if the tunnel client host name must reflect the mapped host.

property LockDestinationHost: Boolean;
Description
LockDestinationHost is a Boolean property that indicates if the tunnel client host name must reflect the mapped host. When a TCP client for the tunnel connection, LockDestinationHost is used to determine if the host name of the client is the MappedHost from the tunnel server or the local IP address for the client using the tunnel.

When LockDestinationHost is True, the tunnel server MappedHost property is used as the Host for TCP client connection. When LockDestinationHost is False, the local IP address for the tunnel client is used as the Host for TCP client connection.