Thanks!

So, reading those answers I assume there is nothing special or particular about the Plus compared to later machines.

I had some electrical problems with that Plus in the past, so I'll have to check if the serial port is OK.

Filesharing ON on both machines? Have you checked in the AppleTalk control panel on the PowerBook 1400 if the port selected is "Serial/Printer Port" instead of "Ethernet" (or something else)?
These are the first two things that come to mind...

Click to expand...

So we've got similar minds…  :beige:

Actually AppleTalk on the 1400 is still set to Ethernet, since it is my "virtual gateway" running LocalTalk Bridge to allow my oldies to get on the Wild Web.

But my guess is some kind of hardware failure, cause again I shared files between the 1400 and a SE minutes before, using the same boot hard drive with same settings.