Hello, I have read a discussion with Tom Shinder on ISA Server forum. Tom Shinder told the following: "When writing our book, I did some experiments connecting to a friend's ServU FTP Server and it worked OK. We were both behind ISA Servers, and I was able to PORT and PASV to the server. We did find that there were some problems connecting to his server if I came in from behind a firewall that was *not* ISA Server". And another guy replied as follows: "Yes. I find the same problem about it. Some of my friend which behind a firewall couldn't list the folder at my ftp". I am suffering the same problem. We have an IIS FTP server on an internal Windows 2000 Server protected by ISA Server. Sometimes, when someone tries to put a file on our FTP server from behind a firewall (Checkpoint Firewall-1 for instance), this file is created but no bytes are written in it (its size is 0 bytes). Besides, sometimes we observe the same behaviour with the "ls": the command hangs and no listing appears. Curiously, when the FTP Server is installed on a Windows 2000 Professional everything seems to work properly. Should I configure the WSPCFG.INI file on ISA Server or something like that? No data about FTP are stored in this file currently. Thank you very much. >>>=============================>> José Eduardo Mohedano jemohedano@xxxxxxxxx JSC Desarrollos y Aplicaciones