PHPMailer \"Connection Refused\" on Linux: Why Did Setting Host to \"localhost\" Fix the Issue?

PHPMailer Connection Refused: Troubleshooting on Linux Server

Recently, a user encountering issues with PHPMailer connectivity after migrating to a Linux server from a Windows environment shared their experience. They determined that the settings they had been using for months were accurate but were no longer functioning effectively.

Error Encountered:

SMTP -> ERROR: Failed to connect to server: Connection refused (111)
SMTP Connect() failed.

Troubleshooting Process:

In collaborating with GoDaddy's technical support, the user discovered that both the server settings and their own settings appeared correct. However, further attempts at troubleshooting proved futile:

• Email sending remained unsuccessful using various port and security configurations.
• Modifying the PHPMailer settings to use a different mail server (Gmail) did not resolve the issue.

Possible Solution:

In their frustration, the user stumbled upon a solution that eventually solved their connectivity problems:

$mail2->Host = localhost;
//$mail2->SMTPAuth = false;
//$mail2->Username = '[email protected]';
//$mail2->Password = '*******';

//$mail2->SMTPSecure = 'tls';

//$mail2->Port = 465;

By switching the Host to "localhost" and commenting out the SMTP authentication, username, and password, the user was able to establish a successful connection and send emails. This suggests that the issue may have been related to the server configuration, specifically the localhost setting.

Conclusion:

This specific case illustrates that troubleshooting PHPMailer connectivity issues can be complex and may require experimenting with different settings. While the exact cause in this instance was not determined precisely, the modified configuration became fully functional. It emphasizes the importance of persistence and exploration when troubleshooting technical problems.

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