SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

[LeDxniel]

I want to create a simple contact form. However, this message always comes up when sending. Does anyone have an idea what the problem is?
Here is my code
https://pastebin.com/2EbfUtd4

[Synchro]

What happened when you followed the advice in the documentation linked from the error message? What does your debug output show when you set $mail->SMTPDebug = 3, as the docs suggest?