Printing Problem on a Network

[complaw]

I'm not sure why, but my Linux box that was printing just fine to a network
printer (via TCP/IP) no longer works.  Netscape, enscript, WordPerfect, Adobe,
all worked fine until, one day (yesterday) they didn't.  I restarted lpd, but to
no avail.  Incidentally, the Linux box has not been rebooted.  Any ideas what I
should do
next?