I have got the same error in a busy server with many transfers.
Anyway to resolve it?
Regards, Agustin
I tracked this problem down last November, and it turned out to be a bug in Tcl:
http://sourceforge.net/tracker/index.php?func=detail&aid=2333466&group_id=10894&atid=110894
If you are using a recent version of Tcl 8.5 (e.g. 8.5.6 or 8.5.7), the problem is gone. If you are using tcl 8.4.*, you have to get tcl from the core-8-4-branch from sourceforge, or patch Tcl yourself and recompile
http://tcl.cvs.sourceforge.net/viewvc/tcl/tcl/generic/tclIO.c?r1=1.61.2.29&r2=1.61.2.30&pathrev=core-8-4-branch
best regards -gustaf neumann