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.
FILEZILLA FTPS SETUP 431 ERROR WINDOWS
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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