8 Effective Ways to Solve Outlook Error 0x800CCC0B

At times while trying to send emails, you may encounter the Outlook error 0x800CCC0B. In this article, we would look at the possible issues that might contribute to this error and offer you 8 effective ways to resolve it.

The standing of MS Outlook as the preeminent desktop mailing client remains steady despite decades in existence. From a plain vanilla mailing client, Outlook has evolved over the years as a collaboration platform for office users, and for many, it doubles up as the repository of their business contacts. While Outlook scores high on its feature set, it does have some faults related to robustness. The application can at times throw up error messages which can confuse even the most experienced user. The Outlook error 0x800CCC0B falls in this league and is typically noticed when you attempt to send emails.

Possible Causes Behind the Outlook Error 0x800CCC0B

There can be several factors that can contribute to the Outlook error 0x800CCC0B showing up. For starters, incorrect SMTP configuration is a typical cause behind this issue. Add to that conflicts with other programs or a corrupted PST file too can contribute to this cause. Issues at the server end like restriction on standard SMTP ports can also lead to this issue.

Outlook Error 0x800CCC0B

#1.  Perform a Hard Reboot to Restart your System

The very first step that you need to take in case you notice the error is to restart your system by performing a hard reboot. Before you perform a hard reboot make sure you save any data and files you are working on.  To execute a hard reboot, press down on the Power button continuously for about ten seconds and you would notice the computer turning off. Wait for few seconds after the system has turned off and press the power button again to restart the system. Once the system has restarted, try sending an email in Outlook to check if the issue has been resolved.

#2. Disable Antivirus Applications or Firewalls Running on Your System

In case you have an antivirus application running on your system or a firewall, try turning off such programs to check if the issue gets resolved.

#3.  Check SMTP Server Settings

Incorrect SMTP server settings can lead to the Outlook error 0x800CCC0B showing up. To verify your SMTP settings, first, check with mail service providers for the correct settings. Next, perform the steps listed below to validate the settings entered before.

  • Launch the MS Outlook application and head to the File tab
  • Under Info head to Account and Social Network Settings and click on Account Settings from the drop-down option
  • Select the relevant email account and double click on it to launch the Change Account screen which shows the Server Information
  • Click on More Settings to open up Internet Email Settings screen
  • Click on the Advanced tab and check the port settings for the Outgoing server. Match it with the port mentioned by your service provider.
Outlook SMTP Server Settings

Note: You may try entering ‘26‘ as the SMTP port number and try sending emails again. In some cases, some email servers tend to block port 25 to prevent spam abuse.

#4.  Create a New Profile in Outlook

In some rare instances, a corrupted MS Outlook profile can produce a situation where the application starts throwing up this error message. To eliminate this rare possibility, consider creating a fresh Outlook Profile and then place the current email account under it.

Create New Outlook Profile

#5. Try Alternate Port Settings

In some instances, different port settings for SMTP and POP3 are known to resolve the issue. To do so, open up the Advanced tab under the Internet Email Settings screen (as shown in #3) and enter 465 as the port number for SMTP and 995 as the port number for POP3. Check if this resolves the issue.

6. Run the Disk Cleanup Utility Present in your Windows System

At times cache entries can conflict with your server settings. To resolve the issue launch the Disk Cleanup utility using the steps listed below

  • In Windows Search Box (Run Box) type in “cleanmgr.exe
  • Once the Disk Cleanup utility shows up, follow the onscreen instructions to initiate the disk cleanup process.  
  • Once the cleanup process is complete, restart your system and open the Outlook application and check if the issue has been resolved
Disk Cleanup in Windows

#7.  Try Repairing the PST Data File with a Powerful Recovery Tool

In case the underlying PST file has developed errors, it can lead to this issue showing up out of the blue. To isolate the issue, use a top-notch recovery tool like DataNumen Outlook Repair to recover the contents of the compromised file. Once the file has been recovered, replace the original file with the Output file and try launching Outlook again.

DataNumen Outlook Repair

#8. Perform a System Restore

Occasionally, despite performing all the steps listed above, the issue may continue to persist. In such a case, you should run the System Restore utility to bring back the system to a previous state by carefully choosing a restore point date when the Outlook application was working in perfect order.

Windows System Restore

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