proftpd - client gets "passive mode refused" and time outs
I have one client who just cannot ftp to my server (running RH7.3/cpanel with proftpd). About 66% of his ftp commands are unsuccesful.Here are the details of his client:
LibNcFTP 3.1.5 (October 13, 2002) compiled for macosx10.2.1
Uname: Darwin|Emilio-Robless-Computer.local.|6.5|Darwin Kernel Version 6.5:
Mon Apr 7 17:05:38 PDT 2003; root:xnu/xnu-344.32.obj~1/RELEASE_PPC |Power
Macintosh
Sysinfo: Mac OS X 10.2.5 (Build 6L29)
He is running Mac OS X - and he says he is turning off his Nortons Personal Firewall to FTP. He has passive enabled in his client. He says he can FTP to other servers just fine - but not mine

Here are some examples from his transfer log:
Cmd: SYST
215: UNIX Type: L8
Cmd: CWD public_html
250: CWD command successful.
Cmd: PWD
257: "/public_html" is current directory.
Cmd: PASV
227: Entering Passive Mode (209,123,134,61,215,229).
Cmd: LIST
150: Opening ASCII mode data connection for file list
226: Transfer complete.
drwxr-xr-x 3 recolte recolte 4096 Apr 17 12:28 Images
drwxr-xr-x 2 recolte recolte 4096 Apr 17 12:27 cgi-bin
-rw-r--r-- 1 recolte recolte 2013 Apr 12 06:16 index.html
drwxr-xr-x 4 recolte recolte 4096 Apr 25 02:26 webtesting
Cmd: CWD webtesting
250: CWD command successful.
Cmd: PASV
227: Entering Passive Mode (209,123,134,61,215,230).
Data connection timed out.
...
Cmd: PWD
257: "/public_html/webtesting" is current directory.
Cmd: PASV
Could not read reply from control connection: Connection reset by
peerPassive mode refused.
Any ideas?