PHP hangs when trying to send 'tls' to port 465

[koogle]

The combination of

$mail->SMTPSecure = 'tls';
$mail->Port = 465;

results in the total php script becoming totally unresponsive .
Might be related #604

[Synchro]

Since #604 suggests that PHP itself lacks the ability to time out correctly, I don't know there's anything we can do - unless you have any better solutions? With that combo I would expect it to open a tcp connection successfully, but then be unable to transmit or receive anything over it due to the broken encryption layer. An appropriate solution is "don't do that" - it's not as if correct values are undocumented. SMTPS on port 465 has been deprecated for 18 years anyway.

[koogle]

I agree with you on that. I would suggest of issuing a warning calling $mail->send() or putting it in the README (if you prefer something I would just create a PR for that).

[Synchro]

A warning for what? We can't know there's a problem until it happens, at which point we can't do anything. You're free to use any protocol on any port, not just standard ones (e.g. it's common to use tls on port 25, and I've seen SMTPS on port 80), so we can't reasonably issue warnings where there isn't a problem as it would just be annoying. The standard port/proto combos are well documented, covered in the troubleshooting guide, and all examples use correct defaults. That said, it would be a good thing to check in the proposed diagnostic function in #612.

[koogle]

Okay. Maybe then I just add a section for this in the troubleshooting guide? Just to let other devs know that there is this problem inside PHP and how it affects PHPMailer.

[ThomasPerraudin]

Have you tried with 'ssl' ?