This unusual message is likely specific to the Motorola CyberSURFER cable modem. In this regard, another reader (Gregg Berretta) using the same modem similarly writes getting a "Failed to Send General Health Check" error. The error immediately shuts down your connection no matter which programs you are running. The problem requires a reboot of the system in order to reestablish a connection." The connection was via Ethernet to coaxial cable and has been duplicated on System 7.5, 7.5.5, and 7.6. - with both O.T.1.1.1 and O.T 1.1.2. Gregg claims that he was told that the problem is ultimately due to a bug in the Mac OS and that "Apple has been aware of this problem since October, 1996." I have not confirmed this.