The "Push Proxy Cancel" Vendor-specific Message
                              Version 1

                          Raphael Manfredi
                    <Raphael_Manfredi@pobox.com>
                          August 30th, 2004
                

SPECIFICATIONS

    Name: "Push-Proxy Cancel"
    Vendor: GTKG
    ID: 21
    Version: 1
    TTL: 1
    Payload: none


DESCRIPTION

This message carries no payload.  It is sent by a servent which no
longer wishes to have the target node be its push-proxy.  This
indicates to the recipient that the sending node has determined that
it was no longer TCP-firewalled.

Due to its nature, the GTKG/21v1 message is sent unsolicited to
registered push-proxies, whether or not they advertised support for it..