What it is
Okay. This is one of those errors that sounds like it should be really easy to solve. But this error can be generated by a lot of things, from incorrect configurations to software conflicts and beyond. Ready? Here we go...
Procedure
Make sure this happens every time they try and connect. If they got it once, panicked, and called us, have them re-connect and try again. If the first page gives them a DNS entry, try clicking on the "Home" button. Sometimes trying it again is all it takes. If that fails:
Now check the table below. It will tell you which Control Panel to check for:
System Software version
Control Panel
7.1.x
MacTCP 2.0.6
System 7.5 and 7.5.1
MacTCP 2.0.6
System 7.5.3 and 7.5.5
MacTCP or TCP/IP
System 7.6
TCP/IP