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outbound connections (curl, sockets) not working for apache but working as root – Plesk

After a recent automatic update to linux components (CentOS v7 with PLesk 17.8.11) my web (php) applications are no longer enabled to do outbound connections.
Both “curl” requests and PHPMailer fail; curl is returning http code 0 with no content, while PHPMailer says “SMTP Connect() failed”.
The same statements/programs work perfectly when run from terminal (root user). In other words, if I write a trivial program executing “curl http://www.example.com” and run it from terminal, it works; if I call it from a browser, it does not work.
The same is true for any program using PHPMailer to send a mail.
SELinux is disabled, so it does not depends on the httpd_can_network_connect SELinux boolean.

Any idea?

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2

Answers


  1. Chosen as BEST ANSWER
    0

    I found a solution, but I did not really understood what the real reason was. By default, my CentOS+Plesk server has SELinux disabled: I changed it to "enabled" with SELINUX=permissive, then I changed two SELinux booleans:

    setsebool -P httpd_can_network_connect on
setsebool -P httpd_can_sendmail on

    Even if SELinux is in warning-only mode, settings those two booleans on made the trick.


  2. 0

    Most likely, affected domains are using system PHP, which was updated recently. Correct me if I am wrong.

    What would explain broken PHP functionality, because during the update of system PHP package, Apache restart is not triggered by Plesk.

    Simply restart Apache in Tools & Settings > Service Management or by using systemctl restart httpd. If the issue still persist after that, try to switch to any of Plesk PHP versions.

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