ftp_nlist(): data_accept: SSL/TLS handshake failed

Question

Once upon a time, there was a normalish error in PHP land:

Warning: ftp_nlist(): data_accept: SSL/TLS handshake failed in [path] on line 29

Answer 1

Although this question is quite old, but in case someone else hits this problem:

If your ftp_ssl_connect and ftp_login works fine but functions like ftp_nlist, ftp_put, ftp_fput don't works the problem might be that your FTP server is using port 21 for Connection but different port ranges for data transfer, that explains why you can connect and login but you can't upload or download data, and you need to allow the Out-going connections to those port range in your firewall

Answer 2

The ftp_nlist opens a data connection. That connection needs TLS/SSL handshake too.

As the control connection handshake succeeded, the problem indeed cannot be with an absent TLS/SSL support in PHP. Neither the problem can be with anything like the server and PHP not being able to find a cipher to agree on.

When TLS/SSL handshake on data connection fails after handshake on control connection succeeded, it's quite usually because the client (PHP) did not reuse TLS/SSL session from control connection on the data connection (see Why is session reuse useful in FTPS?). Some servers do require that. PHP supports the reuse only since 5.6.26. See PHP Bug 70195. So make sure you use that version of PHP at least.