Installed SolidWorks 2015-2016 Educational Edition on about 20 clients a month ago. All worked file.

But now I get license problems on just 4 of them (the rest are OK).

"Cannot find license file (-1,359,2)

Is this a file missing from the client computers or is it that clients can't reach the server?

Is there somewhere on the client that I should be looking for more detailed information?

What does error code(s) -1,359,2 mean?