How to Fix Outlook Error 0x800CCC67?

The Outlook error 0x800CCC67 usually appears when a user tries to manually update folders or synchronize mail items. The error prevents the user from receiving new emails, disrupting the workflow. The error message typically indicates a failure in connecting to the mailbox server when sending or receiving emails, which can be frustrating for users who rely heavily on emails for their daily communication. In this article, you will learn the possible causes of the Outlook error 0x800CCC67 and the solutions with stepwise instructions to resolve the error.

Reasons for the Outlook 0x800CCC67 Error

Below are some common reasons that may trigger the Outlook error 0x800CCC67.

1. Poor network connection
2. Corrupt PST file
3. Incorrect SMTP Settings
4. Corrupted Outlook profile
5. Server timeout settings
6. Interference from Antivirus program or Firewall
7. Faulty installation of Outlook
8. Large email attachments
9. Mailbox server downtime

Solutions to Resolve the Outlook 0x800CCC67 Error

To effectively address the 0x800ccc67 Microsoft Outlook error, follow these detailed solutions. You may need to adjust or choose the solutions depending on your specific version of Outlook and operating system.

1. Check Internet Connection

First, check and verify that your internet is working and stable. For this, open a web browser window and visit Fast.com to check the network speed and reliability. If the network has decent speed and is stable, check whether the mailbox server is available or not. For this, log in to the webmail application of your email provider.

In case your network is unstable, has no internet, or low speed, try restarting the router and reconnecting the Ethernet or modem cable in your router and PC (if connected to a wired network). If you’re using Wi-Fi, try resetting the Wi-Fi adapter on your system.

2. Manage Attachment Sizes

Most email servers have a limit to the size of attachments that users can send. The moment the limit is exceeded, there is an error where the server returns an output to reject the send command. To avoid the occurrence of this error, you should:

• Make sure the total size of files or attachments while creating the email does not exceed the size set on your or the receiver’s email server before sending emails with attachments.
• Compress the files into a ZIP folder or share large files through cloud services, like OneDrive and Dropbox.

Read more: How to Save Mail Attachments in Bulk from Multiple Emails in Outlook

3. Adjust Server Timeout Settings

If the timeout settings in Outlook are set to a lower value, this could lead to failure while sending emails. To avoid this, you can increase the server timeout setting time. The steps are as follows:

• Start Outlook and go to File > Account Settings > Account Settings.
• Click on the email account where you are experiencing the error and then click Change.
• Click More Settings in the Change Account window.

• Then, click on the Advanced tab and increase the timeout by moving the Server timeout slider towards the right side.

Save the changes and restart Outlook. Try sending an email and check if the error 0x800CCC67 is resolved.

4. Verify and Adjust SMTP Settings

Incorrect SMTP settings will not allow Outlook to connect with the email server. So, make sure that your Outlook SMTP settings are correct. For this, follow these steps:

• Open Outlook, go to File > Info > Account Settings, and then select Account Settings from the dropdown.
• Under the Email tab, select your email account and then click Change.
• Then, look under the Outgoing mail server (SMTP), and make sure the server address and port settings are correct. You can confirm these with your ISP or email administrator. You can also refer to the email provider’s documentation for correct settings.
• Also, go to More Settings > Outgoing Server and ensure that My outgoing server (SMTP) requires authentication or Require login using Secure Password Authentication (SPA) is checked. This varies based on the Outlook version installed on your system.  

• After verifying these settings, save the changes and then try sending an email to see if the error persists.

5. Temporarily Disable Firewall and Antivirus Software

Security programs focus on securing a system from malicious attacks. In some peculiar cases, they wrongfully block legitimate application functionalities, like that of Outlook, or even conflict with Outlook, by not allowing it to work smoothly. Such programs may also prevent Outlook from sending new emails, resulting in the error 0x800CCC67. To verify this, you can disable the program temporarily. Here’s how:

• Find your antivirus icon in the system tray, right-click on it, and then look for Disable or a similar option, like Quit.
• Choose the time frame (if required) for which you want it disable it.

Also, access your firewall settings through Control Panel or Windows Settings and then disable the firewall temporarily.

After this, try sending an email with Outlook. If the error does not appear, consider adding an exception for Outlook in both your antivirus and firewall settings before re-enabling them. You may also choose an Outlook-aware security app for system protection and to avoid such errors.

6. Disable Add-Ins

Faulty add-ins are known to cause errors and issues in Outlook. To remove the add-ins, follow these steps:

1. Close Outlook. While holding the Shift key, double-click on Outlook to launch it in safe mode. Alternatively, you can press Windows + R, type outlook.exe /safe and press Enter to start Outlook in safe mode.

1. Then, click File > Options and select Add-ins.
2. Click the Go… button and uncheck all the add-ins.
3. Click OK to disable all the add-ins.

Once the add-ins are disabled, restart Outlook normally. Then, try sending an email.

7. Repair Outlook Installation

Incomplete or improper installation or damaged program files of Microsoft Outlook can sometimes result in unexpected errors. In that case, you can repair the Outlook program to resolve the issue. Follow these steps to repair the Outlook program:

• Close Outlook.
• Go to Control Panel > Programs > Programs and Features.
• Find Microsoft Office or Outlook in the list, select it, and then click Change at the top.

• Choose the Quick Repair option and click Repair.

Complete the repair wizard. Then, restart the system and Outlook.

If the issue persists, try Online Repair. But this option requires an internet connection and is more comprehensive.

8. Reinstall Outlook

If the Outlook repair fails to fix the Outlook error 0x800CCC67, you can try reinstalling Microsoft Outlook. The steps are as follows:

• Close Outlook.
• Go to Control Panel > Programs > Programs and Features.
• Find Microsoft Office or Outlook in the list, select it, and then click Uninstall at the top.
• Follow the onscreen instructions to remove the Outlook/MS Office.
• Then, download the MS Office or Outlook setup file and install it.

9. Create a New Outlook Profile

An Outlook profile is a set of configurations and settings that govern how Outlook works. If the profile gets corrupted, this could result in errors, such as 0x800CCC67. To fix this, you can create a new profile, configure your email under this new profile, and then replace the older profile with the new one. The steps are as follows:

• Close Outlook.
• Open Control Panel and then click User Accounts > Mail.
• Click Show Profiles.
• Click the Add button, enter a name for the new profile, and then enter your email, password, and other required details to add your email account under this new profile.
• Once the profile is created, in the Mail Setup window, select Prompt for a profile to be used.
• Open Outlook and choose the new profile from the dropdown.

Now check whether you can send emails without encountering the error 0x800CCC67.

10. Repair Corrupt PST File

PST file holds all the mail items, including the information regarding your POP3 email server and settings. If this PST file is inconsistent, corrupted, or damaged, it’s very plausible that Outlook will not be able to read/write to the file, which can lead to connectivity issues with the mailbox server and result in the 0x800CCC67 error. To resolve the issue, you can repair the PST file by following these steps:

• Close Outlook.
• Press the Windows + R keys, type %programfiles%/Microsoft Office/ or %programfiles(x86)%/Microsoft Office/ and press the Enter key.

• Open the Officexx folder or root/Officexx folder. This may vary based on the Outlook or Windows version installed on your PC.
• Then, find and launch the SCANPST.EXE program. 

• Click Browse to select the PST file located at %localappdata%/Microsoft/Outlook folder or C:\Users\YourUserName\AppData\Local\Microsoft\Outlook folder.
• Once the PST file is selected, click the Start button.

• The tool scans the PST file thoroughly. If any errors and inconsistencies are found, click the Repair button.

Note: The repair process may take a while based on the PST file size and corruption level.  

• After the repair, start Outlook.

In case the SCANPST fails to repair the PST file or crashes during the repair process, you can use Stellar Repair for Outlook to repair the PST file. This advanced tool, unlike SCANPST, can repair and recover all the mail items from a large (up to 50 GB), damaged, corrupt, or encrypted PST file and save them to a new PST file. You may also export all mail items from such PST files directly to Microsoft 365 or live Exchange Server with complete integrity.

Conclusion

Resolving the Outlook error 0x800CCC67 involves understanding its causes and methodically applying the appropriate fixes. By following the solutions discussed in this post, you can fix the error 0x800CCC67 and ensure a seamless communication experience. For issues arising from severe PST file corruption, using a robust PST repair tool like Stellar Repair for Outlook can be particularly effective. This tool not only repairs corrupted PST files with complete integrity and precision but also helps recover all the contents such as emails, attachments, contacts, and calendars.

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About The Author

Ravi Singh

Ravi Singh is a Senior Writer at Stellar®. He is an expert Tech Explainer, IoT enthusiast, and a passionate nerd with over 7 years of experience in technical writing. He writes about Microsoft Exchange, Microsoft 365, Email Migration, Linux, Windows, Mac, DIY Tech, and Smart Home. Ravi spends most of his weekends working with IoT (DIY Smart Home) devices and playing Overwatch. He is also a solo traveler who loves hiking and exploring new trails.