![]() ![]() ![]() UPDATED (Now with Filezilla client instructions) ![]() Remember to reset your firewall to port 990 as well, and to restart your IIS server for the changes to take effect. Changing the port in IIS is quite simple, in step 4 of the tutorial that you used, just change the default port of 21, as seen in the image below, to the FTPS port of 990. If you do not control the client, and which ports they are allowed to connect to, you should change your IIS FTP port from the default of 21 to the industry standard 990. So, if you know that you will only send your traffic over port 21, just remember that the server requires an SSL connection. Ports are agnostic, that is, they don't particularly care if the traffic you send through is encrypted or not, and they only require that the same port is being used for both the sender (the server) and the receiver (the client) of traffic. Despite the similar name, SFTP is a totally different animal, which transmits files over an SSH (Linux standard) connection. What you are setting up is actually FTPS, or FTP-Secure, and Filezilla noted this with a successful 220 response in your test. Q: How can I troubleshoot this further (is there a debug mode for the ISS FTP) ? I also had a look at the FTP logs in c:\inetpub\logs\LogFiles and all I get are useless messages such asĬontrolChannelOpened, ControlChannelClosed, AUTH TLS, AUTH SSL which don't help with understanding why things are actually failing. 21, 22, 990., TCP-handshake is properly established in every case) and I get the same behaviour whatever I try. I've added several ports to the FTP binding on IIS (e.g. I'm sniffing traffic with wireshark and I can see that filezilla is properly using the port I'm setting. I've tried every protocol Filezilla is offering me ( FTPS, SFTP, FTPES): either Filezilla starts talking clear-text FTP and IIS returns Response: 534 Policy requires SSL, or it tries to initiate a secure connection and I get responses such as Response: 451 The parameter is incorrect or Response: 431 Failed to setup secure session. Q: How can I troubleshoot this issue further (ultimate goal is to be able to force client of secured FTP)? Additional troubleshooting SFTP mode -> client happy after receiving Response: 220 Microsoft FTP serviceįTPS mode -> client sending what looks like a client hello, fails with Response: 451 The parameter is incorrect. tried filezilla as a client and did following tests over port 21:įTP mode -> fails with Response: 534 Policy requires SSL. settings, the only one list is fto (21) and there aren't any other FTP-related choices I can add. based on this list of TCP port I was expecting to see either FTPS (990) or SFTP (22) opened. did nmap to the server which reported the below ports: PORT STATE SERVICE However I'm not able to connect to the FTP server over SSL. Following these instructions I managed to configure my FTP server for SSL on a windows server 2008 (IIS 7) while enabling Require SSL connections. ![]()
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