I have tried to find a good solution with AWS, but cannot find any detailed information regarding EBS and EC2 servers, and whether an EC2 package will be able to handle FTP storage. If the server really returns 0,0,0,0 in a response to the PASV command, it's clear why the client cannot connect to the server, when the PASV is used.My company is looking for a solution for file sharing via FTP - currently, we share one server for client/admin FTP file sharing and serving multiple sites, and are looking to split off our roles so that we have one server dedicated to FTP and one for serving websites. And the client connects to the FTP server IP address implicitly. So with the EPSV, only a port number is included. The EPSV was introduced later than the PASV, when it was clear that the IP address presence in the response is problematic. And it commonly causes problems, when the server is not aware of its external IP address. Just to explain the difference between the PASV and the EPSV: The PASV returns an IP address in the response. Keeping an original explanation of the PASV vs. It works (and makes sense), when the IP address is "autodetected" from p_sess->p_local_addr, but fails, when the pasv_address address is used.Ĭonsider reporting this to the author of vsftpd. P_addr_start = (const unsigned char*)&p_addr->u.u_sockaddr_in6.sin6_addr If (vsf_sysutil_memcmp(pattern, &p_addr->u.u_sockaddr_in6.sin6_addr, 12)) If (p_addr->u.u_sockaddr.sa_family != AF_INET6) Vsf_sysutil_sockaddr_ipv6_v4(const struct vsf_sysutil_sockaddr* p_addr) Where the vsf_sysutil_sockaddr_ipv6_v4 returns 0, if the s_p_sockaddr is not IPv6, what it never is, when the pasv_address is set. Str_append_text(&s_pasv_res_str, vsf_sysutil_inet_ntoa(p_v4addr)) Str_append_text(&s_pasv_res_str, vsf_sysutil_inet_ntop(s_p_sockaddr)) Ĭonst void* p_v4addr = vsf_sysutil_sockaddr_ipv6_v4(s_p_sockaddr) Str_alloc_text(&s_pasv_res_str, "Entering Passive Mode (") Vsf_sysutil_sockaddr_clone(&s_p_sockaddr, p_sess->p_local_addr) If (vsf_sysutil_inet_aton(tunable_pasv_address, s_p_sockaddr) = 0) * Report passive address as specified in configuration */ Vsf_sysutil_sockaddr_alloc_ipv4(&s_p_sockaddr) Handle_pasv in postlogin.c: int is_ipv6 = vsf_sysutil_sockaddr_is_ipv6(p_sess->p_local_addr) To prove that this is indeed a bug, check this code of the latest vsftpd release (3.0.3): See Cannot list FTP directory using ftplib – but FTP client works Or make ftplib ignore the IP address returned by the server. The only other solution is removing a private IPv6 address, if it is possible in EC2. To fix this, make sure the server does not listen on IPv6 address (what is the default behavior, which you are overriding by setting listen_ipv6=YES): listen_ipv6=NO *resp* '227 Entering Passive Mode (0,0,0,0,50,245).'ĬonnectionRefusedError: Connection refusedįrom the code it looks like, it will always send the 0,0,0,0, if the public pasv_address is set, but the server has a (local) IPv6 address. Test through Python ftplib from ftplib import FTP However, with it works with EPSV (with IPV6 checkbox selected), the log as below: 220 (vsFTPd 3.0.3)Ģ29 Entering Extended Passive Mode (|||13082|)Ĥ. With PASV mode, I cannot connect to FTP server, the log is: 220 (vsFTPd 3.0.3) I searched around but find no answers, any body can help me with this? However, it works with EPSV, don't know why. I set up an FTP server on AWS EC2 (Ubuntu16.04) with passive mode ( PASV), but it doesn't work.
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