FTP / SSL working internally but stopping at Listing Directory
Hi
We have a basic FTP server which runs FTP / SSL on port 21, it works fine internally and almost externally apart from the fact it wont list the directories, I have all the firewall rules correct as it is connecting just not listing the directories.
I have heard this has something to do with Passive/Active modes and NAT but as this is the first FTP / SSL system I have built I am not sure how to get this sorted.
FYI: this runs on a DC with only IIS FTP services installed.
We have a basic FTP server which runs FTP / SSL on port 21, it works fine internally and almost externally apart from the fact it wont list the directories, I have all the firewall rules correct as it is connecting just not listing the directories.
I have heard this has something to do with Passive/Active modes and NAT but as this is the first FTP / SSL system I have built I am not sure how to get this sorted.
FYI: this runs on a DC with only IIS FTP services installed.
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Try enabling logging on your firewall to see what data port(s) are being blocked. Did you try switching between active and passive mode using the FTP client when testing? If you intend to support both modes, try performing a directory listing with both modes when logging at the firewall.
Alternatively, you can run TCPView on both sides (server and client) to see what connections are attempted when performing a directory listing.
Alternatively, you can run TCPView on both sides (server and client) to see what connections are attempted when performing a directory listing.
ASKER
Still cannot list the directories. Also I have open ports 20,21.