I'm going to show to all of you a problem concerning file transfer that involves a Cisco PIX 515E 6.3 (4), an ftp server (SERV-U) and a client side.
Client side is composed of an automatic procedure (in order to download files) running on a Windowx XP and an ISA Server 2000.
Every 5 file transfer, at least 2 fail with this kind of error:
from ftp server side
Error sending file customer-file.txt, aborting (0 bytes/sec - 0 bytes, unable to open data connection)
and from PIX side
%PIX-6-303002: Customer Public IP Retrieved FTP Server Public IP:customer-file.txt
%PIX-4-106023: Deny tcp src inside:FTP Server Private IP/20 dst outside:Customer Public IP /4198 by access-group "acl-outbound"
.........................................but, there is not any acl-outbound denying that kind of traffic
Please, anyone of experienced that kind of trouble?