Error from php program when trying to upload a pdf file to remote server:

PHP Warning:  ftp_put(): Entering Extended Passive Mode (|||65500|) in /home/client/libraries/php-ftp-client/FtpClient/FtpWrapper.php on line 85
PHP Warning:  ftp_put(): PASV: Operation not permitted in /home/client/libraries/php-ftp-client/FtpClient/FtpWrapper.php on line 85

This is caused by ProFtpd on the remote server. To solve, add option TLSOptions NoSessionReuseRequired in /etc/proftpd/tls.conf

• Debian 10
• php 7.3

Ftp ftp_login(): SSL/TLS handshake failed

• https://stackoverflow.com/questions/36224773/ftp-not-working-via-php-proftpd-operation-not-permitted