I forgot to mention that the source for qftp.exe client is available at:
http://www.nbpfaus.net/~pfau/ftplib/ftplib-3.1-1.zip
Look in winnt folder (binaries are in winnt/release, er winnt\release).
------- Additional Comments From blin@gmx.net 2007-20-02 20:13 ------- I'd be interested in a +winsock trace. One for each failing client, if possible.