Novell NETWARE 6-DOCUMENTATION Manual page 610

If you can't copy a file from an FTP mapped drive, check the Drive
Monitor Log window for FTP/HTTP status responses.
If you can't find a file on your NetWare 6 FTP server, flush your directory
cache. To do this, in the NetDrive Main Window click File > Program
Settings > Cache > Flush Directory Listing upon Each Connection.
If you can't rename your files, it might be because your NetWare 6 FTP
server doesn't support this functionality.
If you are unable to map a network drive, remove the lastdrive=g
statement in your NetWare 6 FTP server's CONFIG.SYS file and then
restart your server.
If you get a TCP/IP connection error and you are using the ZoneAlarm
firewall, make sure the security level is set to medium or disable
ZoneAlarm.
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Novell NetDrive Administration Guide