id summary reporter owner description type status priority component resolution keywords cc component_version os os_version 11916 After upgrade 3.42.1, TLS connections to proftpd server broke flyvehest "After getting reports on connection errors, I tested my setup, which worked fine. (Unfortunately, i'm not sure what version I was running at the time, but it was not more than a couple months old) I then upgrade FileZilla to latest, and when I connect to my ProFTPd server now, I get the following errors clientside {{{ Response: 150 Opening BINARY mode data connection for file list Error: GnuTLS error -58: An illegal TLS extension was received. Error: The data connection could not be established: ECONNABORTED - Connection aborted Response: 425 Unable to build data connection: Operation not permitted Error: Failed to retrieve directory listing }}} and this is what I see serverside {{{ 2019-05-12 09:37:05,083 mod_tls/2.8[18]: TLS/TLS-C requested, starting TLS handshake 2019-05-12 09:37:05,090 mod_tls/2.8[18]: client supports secure renegotiations 2019-05-12 09:37:05,090 mod_tls/2.8[18]: TLSv1.2 connection accepted, using cipher ECDHE-RSA-AES256-GCM-SHA384 (256 bits) 2019-05-12 09:37:05,154 mod_tls/2.8[18]: Protection set to Private 2019-05-12 09:37:05,157 mod_tls/2.8[18]: unable to accept TLS connection: system call error: [104] Connection reset by peer 2019-05-12 09:37:05,157 mod_tls/2.8[18]: unable to open data connection: TLS negotiation failed }}} Server is setup with session reuse, and everything was running fine before updating." Bug report new normal FileZilla Client tls 3.42.1 Windows 7