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The SIGSUSR1 (or SIGHUP) closes and reopens the UDP socket -- which may be necessary when communicating over a connection-oriented link. Probably some parameter in the IP stack which the UDP socket depends upon is timing out after 15 minutes. I've just tried tcp instead of udp. This works the same way as ssh does. No SIGUSR1 required and the tunnel can be used as soon as the isdn link is up. I will try how stable the tcp tunnel is for a few more hours. Claas Hilbrecht |