Pb with FTP & ISA in cache mode

Hi all,
I installed ISA server (with SP1) on W2k server SP2 in cache mode.
All is ok about HTTP et HTTPS but not for FTP.
I created a protocol rule which authorised all IP traffic for all.
When I try to reach a ftp site via IE, I have this error message :
"ISA Server : message d'erreur étendu :
200 Type set to I
500 Illegal port command"
In ISA manager, I can't create new protocols, so I have the default : FTP
download only, HTTP, HTTPS et Gopher.
I read a lot of mails about FTP pb and ISA in firewall mode but not with
ISA in cache mode.
Someone has an idea ?
Thanks and sorry for my "frenchy" english !
Muriel.


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