Troubleshooting Outlook Error 0x800CCC18

Error 0x800CCC18 occurs when your email client (such as Microsoft Outlook, Outlook Express, or Windows Live Mail) attempts to log in using a specific authentication method that is not supported by the mybox infrastructure.

Specifically, this error is triggered when the “Secure Password Authentication” (SPA) or “Log on using Secure Password Authentication” option is enabled in your account settings.

How it works

Secure Password Authentication (SPA) is a proprietary Microsoft protocol designed for specific server environments (like Exchange). mybox uses standard, secure IMAP/SMTP authentication combined with SSL/TLS encryption, which is the industry standard for web hosting.

When SPA is turned on, Outlook tries to use a handshake that the mybox server does not recognize, resulting in an immediate connection failure.

Distinction Block

SPA vs. SMTP Authentication SPA (Secure Password Authentication) is a specific login protocol that should be disabled. SMTP Authentication is the standard requirement to verify your username and password when sending mail; this must be enabled.

How to Resolve

To fix error 0x800CCC18, you must disable the SPA setting in your Outlook account configuration:

1. Open Outlook and go to File > Account Settings > Account Settings.
2. Select your mybox email account and click Change.
3. On the main settings page, locate the checkbox labeled “Log on using Secure Password Authentication (SPA)”.
4. Uncheck this box.
5. Click Next to test the settings and then Finish.

Practical Implications

• Security: Disabling SPA does not make your account insecure. As long as you have SSL/TLS or STARTTLS enabled in your “Advanced” port settings, your password and messages remain fully encrypted during transmission.
• Compatibility: SPA is rarely used in modern web hosting. Disabling it ensures that your client uses standard MD5 or PLAIN authentication over a secure (SSL) tunnel, which is compatible with almost all devices and providers.
• Immediate Fix: In nearly every case, unchecking this single box will instantly resolve error 0x800CCC18 and allow your mail to sync.

Summary

Error 0x800CCC18 is a configuration mismatch. By disabling the SPA option and relying on standard SMTP authentication over a secure port (like 587 or 465), you maintain a high level of security while ensuring full compatibility with the mybox platform.