A network connection system includes a client apparatus, an authentication server, and a connection server. The authentication server authenticates a user of the client apparatus and transmits a network address of the client apparatus to the connection server. When information indicating the transition to a connection wait state is received from the connection server, the network address of the connection server is transmitted to the client. The client apparatus transmits an encrypted user name and password to the network address. The connection server 11 conducts authentication using the encrypted user name and password.