Hi, I run a RV042 router with a cable connexion. I have a IIS 6.0 server behind the router (W2K3) with FTP Service. All was running fine with the default port (21). For security reason, I have to change the port so I choose a number higher than 1023. Since that, my user which was behind a router (any mark) was unable to list their folder because the client (ftp.exe or gui client) return the following : Error 500 Invalid Port Command. The link with the router ? After some googling on the net, I found some article (Microsoft and others) that tell that the NAT translate of the router is the problem. Anybody have the same problem and what was your solution ? Is there a solution ? Some will tell me to use another ftp server, I will do it if I don't have the choice ... Any idea ?