"Without a full example (see the footer of this message) we cannot tell
what you (or a package you are using) did wrong. "
That's the main point. But one possibility might be that if they're using
TINN-R on Windows, this warning occurs all the time as Tinn-R opens
connections for sourcing data into R. Totally innocuous. But just a guess
without the info as above.
-- Bert Gunter
Genentech