Problem with FTP and tcsh

[Susanne Ramsey]

If this has been covered before I apologize...  I have a problem with FTP
and tcsh.  We are running 4.1 of SUN Operating system and the most current
version of tcsh.  I have several users who have just converted over to
tcsh.  When they try and ftp to their account from another system they get
the following 

ftp> user jac
530 User jac access denied.
Login failed.

This only happens for people running tcsh..  Can anyone tell me why..???