When trying to upload files to a SCO Unix system, every file uploaded, reported as failed by TFTP. The some of the programs configuration switches, also seemed not to work. (Passive Mode Switch) Turning it off had no effect it still transfered in passive mode.
I'm not sure what problem is being referred to since 1) tftp is very sldom (and very insecurely) used for uploads 2) there is no "passive mode" in tftp. 3) If you meant ftp rather than tftp, then there is insufficient information to diagnose the problem.
When trying to upload files to a SCO Unix system, every file uploaded, reported as failed by GFTP. The some of the programs configuration switches, also seemed not to work. (Passive Mode Switch) Turning it off had no effect it still transfered in passive mode.
GFTP is in X windows environment
I presume that you are using gftp-1.13-4 that shipped with 6.0, not the update gftp-2.0.3-1 that we released a few months later as an update. Please try the update, or the latest gftp from rawhide ftp://ftp.redhat.com/pub/rawhide/i386/RedHat/RPMS/gftp-2.0.4-1.i386.rpm and see if they fix the bug.
No further comments from reporter - assumed fixed.