CSS and Extended Passive FTP problem.

Hi everyone.
I'm having a problem setting up a load balanced cluster of FTP servers behind a CSS 11506.
I can FTP into the cluster fine. I am redirected to one of the machines in a round robin fashion and can log in. The problem arises on mac's where typing in an ls command returns this:
ftp> ls
229 Entering Extended Passive Mode (|||32999|)
200 EPRT command successful
421 Service not available, remote server timed out. Connection closed
Now, if I type in the EPSV command and disable Extended Passive Mode prior to connecting to it, it works fine.
Also, connecting to any of the servers directly with epsv enabled works fine as well.
We have over 800k hits per month and telling everyone to disable epsv will be a problem. Is there a way to enable extended passive mode through the css?
Here is my config:
Group: ftpServers1 - Active (198.202.122.181 Not Redundant)
Session Redundancy: Disabled
Last Clearing of Stats Counters: 03/20/2007 14:28:25
Associated ACLs: NONE
Source Services:
DNS
Name: Hits: State: Load: Trans: Keepalive: Conn:
rem_ftp1 19857 Alive 44 6 FTP 0
rem_ftp2 38175 Alive 87 0 FTP 0
Destination Services:
NONE
Group Service Total Counters:
Hits/Frames/Bytes: 58032/58339/4277264
Connections Total/Current: 25/0
FTP Control Total/Current: 0/0
CSS11506# show rule pdb ftp-rule1
Name: ftp-rule1 Owner: pdb
State: Active Type: FTP
Balance: Round Robin Failover: N/A
Persistence: Enabled Param-Bypass: Disabled
Session Redundancy: Disabled
IP Redundancy: Not Redundant
L3: 198.202.122.181
L4: TCP/21
Url:
Redirect: ""
TCP RST client if service unreachable: Disabled
Rule Services & Weights:
1: rem_ftp1-Alive, S-1
2: rem_ftp2-Alive, S-1
Thanks
Boki

EPSV is not supported.
The only workaround available to load balance passive ftp servers is to use "PASV" command instead of "EPSV" on clients.
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