3.1.5.1 Start-Control-Connection-Request Message

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The Start-Control-Connection-Request message specified in [RFC2637] section 2.1 is used to initialize the tunnel. The originator SHOULD start the Control Connection Idle Timer (section 3.1.2) and enter the wait_ctl_reply state after sending the Start-Control-Connection-Request message as specified in [RFC2637] section 3.1.1. The originator SHOULD exit the wait_ctl_reply state either after receiving the Start-Control-Connection-Reply message from the peer or after the Control Connection Idle Timer expires.

When the PAC/PNS receives an incoming connection on the PPTP TCP port (default 1723), it SHOULD start the Control Connection Idle Timer and wait for the Start-Control-Connection-Request message. If the PAC/PNS does not receive the Start-Control-Connection-Request message from the client of the TCP connection before the Control Connection Idle Timer expires, it SHOULD discard the attempted connection.