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Outlook Error 0x800CCC0E: Reasons, Signs, and Step-by-Step Solutions

Ritu Roy | fix how to mac os outlook outlook error software technology | 5 minutes read | Modified on: 05-01-2026
Fix Outlook Error 0x800CCC0E

Microsoft Outlook is a widely used email client trusted by individuals and businesses alike for managing both personal and professional communication. Its popularity stems from the powerful features it provides, including advanced organization tools, calendar integration, and productivity enhancements. Despite its reliability, users sometimes run into errors that disrupt their workflow. One of the most common issues is Outlook error 0x800CCC0E, which occurs when Outlook fails to establish a connection with the mail server. As a result, users are unable to send or receive emails, causing interruptions in communication.

While searching for a fix, you might find numerous solutions claiming quick results. However, before trying any remedy, it’s important to understand what Outlook error 0x800CCC0E actually is and how to confirm that this is the error affecting your account.

What is Outlook Error 0x800CCC0E?

Outlook Error 0x800CCC0E is a common server connection issue that arises when Microsoft Outlook is unable to establish a stable link with either the incoming (POP3/IMAP) or outgoing (SMTP) mail server. Users encountering this error may see messages such as:

  • “Outlook cannot connect to the Outlook (SMTP) server.”
  • “Error Code: 0x800CCC0E”
  • “Connection to the server failed.”

This error is most frequently seen in the desktop version of Outlook. It can happen due to a variety of reasons, including incorrect email account settings, an unstable or weak internet connection, firewall or antivirus restrictions, or conflicts with third-party applications. Understanding the root cause is the first step toward resolving it effectively.

Common Causes of Outlook Error 0x800CCC0E

Understanding the reasons behind this error can help you troubleshoot it more effectively. The most common triggers include:

1. Incorrect Email Server Settings: If the SMTP, POP, or IMAP server details or login credentials are entered incorrectly, Outlook will fail to connect to the mail server, leading to error 0x800CCC0E.

2. Weak or Unstable Internet Connection: A slow or unreliable network can interrupt communication between Outlook and the mail server, preventing emails from being sent or received.

3. Antivirus or Firewall Interference: Sometimes, security programs mistakenly block Outlook’s network activity or disable essential ports (such as SMTP ports 587 or 465), which can stop the email client from connecting to the server.

4. Large or Corrupted Emails in the Outbox: Emails that are unusually large or corrupted can disrupt the normal Send/Receive process. Outlook may get stuck trying to process these messages, causing connection failures.

5. Corrupted Outlook Profile: An Outlook profile that has been in use for a long time may become damaged. If the associated PST or OST data file is corrupted, it can lead to synchronization problems, including the inability to connect to the server, resulting in error 0x800CCC0E.

How to Identify Outlook Error 0x800CCC0E

You can usually tell that this error is occurring by observing the following signs:

  • Emails are not being sent or received as expected.
  • Outlook displays warnings about SMTP connection timeouts.
  • Frequent messages appear stating that the mail server is not responding.

Read More: How to Fix Outlook Keeps Disconnecting from Exchange Server.

How to Fix Outlook Error 0x800CCC0E

If you’re facing Outlook Error 0x800CCC0E, you can try the following solutions to restore proper email functionality.

1. Enable SMTP Authentication

Sometimes, the error occurs because Outlook is not set to authenticate outgoing emails properly. To fix this:

  1. Open Outlook and go to Account Settings.
  2. Select your email account and click More Settings.
  3. Navigate to the Outgoing Server tab.
  4. Check the option “My outgoing server (SMTP) requires authentication.”
  5. Select “Use same settings as my incoming mail server.”
  6. Click OK and restart Outlook.

2. Temporarily Disable Antivirus and Firewall

Security software can occasionally block Outlook’s connection to the server, causing this error. To check if this is the cause:

  1. Temporarily disable your antivirus program.
  2. Turn off the Windows Firewall.
  3. Try sending or receiving an email.
  4. If it works, add Outlook as an exception in your antivirus and firewall settings, then re-enable security.

3. Change the SMTP Port

Sometimes, your Internet Service Provider (ISP) may block the default SMTP port. Changing it can resolve the issue:

  1. Go to Account Settings > More Settings > Advanced.
  2. Under Outgoing Server (SMTP), try changing the port to 587 or 465.
  3. Click OK and save the changes.

4. Create a New Outlook Profile

A corrupted Outlook profile can cause repeated connection problems. To create a new Outlook profile:

  1. Open the Control Panel and go to Mail > Show Profiles.
  2. Click Add to create a new profile.
  3. Set up your email account in the new profile.
  4. Choose “Always use this profile” and select the newly created one.

5. Verify Email Server Settings

Incorrect server details or login credentials can prevent Outlook from connecting to your mail server. To check:

  1. Confirm the SMTP server name provided by your email provider.
  2. Double-check your username and password.
  3. Ensure the correct encryption type (SSL/TLS) is selected.
  4. Correct any mistakes and restart Outlook.

Following these steps usually resolves Outlook Error 0x800CCC0E and restores your ability to send and receive emails.

6. Repair Outlook Data Files (OST/PST)

Corrupted or damaged Outlook data files (OST or PST) can cause synchronization problems and trigger server connection errors, including error 0x800CCC0E. To repair these files:

  1. Close Microsoft Outlook.
  2. Open the Inbox Repair Tool (ScanPST.exe) on your computer.
  3. Browse and select the affected OST or PST file, then start the repair process.
  4. Once the repair is complete, restart Outlook and check if the issue is resolved.

7. Keep Outlook Updated

Running an outdated version of Outlook can lead to compatibility problems and unexpected errors. To make sure your Outlook is up to date:

  1. Open Outlook and go to File > Office Account.
  2. Click Update Options > Update Now.
  3. Install any available updates and restart Outlook.

For related troubleshooting tips, see our guide: How to Fix Error Code 0x8000FFFF.

Important Note: If the error 0x800CCC0E is caused by a corrupted PST file or an unstable Outlook profile, using a reliable third-party tool like MacArmy PST Converter can help resolve the issue quickly and safely.

Conclusion

Outlook Error 0x800CCC0E is a common problem that usually arises when Outlook is unable to connect properly to the mail server. Fortunately, this error can be resolved by taking the right steps. Checking your internet connection, verifying and correcting email account settings, enabling SMTP authentication, and adjusting firewall or antivirus configurations often fix the issue.

If the error continues, creating a new Outlook profile or reaching out to your email service provider can help restore proper functionality. By following these troubleshooting measures carefully, you can get Outlook working smoothly again, ensuring uninterrupted email communication.