Apple Macintosh System 7.5 - Manual (Page 104)

I can’t switch from a serial to an Ethernet connection.
If you use an expansion card to connect to Ethernet, make sure the card is
installed correctly.
Make sure your Ethernet cables are connected properly.
Make sure your network is functioning correctly.
I can’t remember my Administration password.
You can erase your Administration password (along with all of your
AppleTalk settings and configurations) by dragging the AppleTalk Preferences
file (inside the Preferences folder in your active System Folder) to the Trash.
When you open the AppleTalk control panel again, you must reenter all your
settings.
TCP/IP troubleshooting suggestions
I can’t connect to devices outside my local network.
Make sure your router address is correct.
Make sure your subnet mask is correct.
I can connect to hosts by IP address, but not by name.
Make sure you have entered at least one name server address, and that the
address is correct. If you have entered more than one, make sure the most
reliable ones are listed first.
Make sure you have entered valid domain names in the Additional Search
Domains box.
If you have entered starting and ending domain names for an implicit search,
double-check to make sure they’re correct. (The local and administrative
domain names can be entered only when the TCP/IP control panel is set to
Advanced or Administration user mode.)
96 Chapter 7