Re: FTP on Server 2008
- From: Tim Judd <tjudd01@xxxxxxxxxxx>
- Date: Wed, 14 Oct 2009 08:49:43 -0600
Steve wrote:
I have one Server 2008 just ahead main ADSL router. Through port forwarding I can access it from outside.
I have enabled ports 21 and 443 also, but cannot access to the Server.
I checked telnet server 21 and 443 from this server, but it isn't opened, even FTP is enabled in Windows Firewall with Advanced Security.
Please help, how to open ports 21, 80 and 443 on Server 2008?
FTP is still having problems through firewalls. It's a protocol designed before firewalls, so the concept of passing through firewalls is foreign to it. So far, all we have are workarounds to a protocol that doesn't naturally fit on RFC1918 addresses.
FTP uses TCP port 21 for it's "command channel" where all the commands, status prompts and feedback are on.
FTP also uses TCP port 20 (the "data channel"), and random (ports >1024 all the way through the highest port, 65535) ports to transfer the actual data.
Allowing 21 through only allows the command channel through. You won't be able to transfer files. Since passive FTP lets the FTP server connect to the client at random ports, firewalls block that. Whether the blocking is outgoing or incoming, it's blocked.
To have successful FTP, in the protocol it was written for, the machine has to be completely exposed on that IP. No firewall action on either end.
I haven't yet seen the .dll or .exe that serves as the ftp server (for Active or Passive mode) to allow it through the firewalls.
Good luck.
.
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