FIX: Outlook error 0x800ccc0f in Windows 10

Matthew Adams
by Matthew Adams
Windows & Software Expert
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Outlook error 0x800ccc0f
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The Outlook error 0x800ccc0f is one that occurs for some Outlook users when sending or receiving emails.

When the error occurs, it returns the following error message: Task server name – Sending and Receiving reported error (0x800ccc0f): The connection to the server was interrupted. If this problem continues, contact the server administrator or Internet service provider (ISP).The server responded:? K’

Consequently, Outlook error 0x800ccc0f ensures that SMTP emails aren’t sent or received. This is how you can resolve the Outlook error 0x800ccc0f in Windows 10.

Steps to get rid of Outlook error 0x800ccc0f

  1. Check Your Internet Connection
  2. Switch Off Anti-virus Software
  3. Switch Off the Windows Firewall
  4. Increase the Server Timeouts Setting in Outlook
  5. Run Outlook in Safe Mode
  6. Repair Outlook PST Files

1. Check Your Internet Connection

It might just be the case that your internet connection is down. So check that websites are opening in your browser. If not, the issue is obviously due to a connection error.

Rebooting your router might fix the connection.


Check out this amazing article for some further tips for fixing internet connections.


2. Switch Off Anti-virus Software

Anti-virus software that scans emails can hamper Outlook‘s incoming and outgoing emails. As such, disabling third-party anti-virus utilities might fix Outlook error 0x800ccc0f.

You can disable many anti-virus utilities by right-clicking their system tray icons and selecting a disable, pause or exit option. However, you might need to disable some anti-virus utilities via their windows.


Did you know that your antivirus can block emails? Check out this guide to find out how to fix the issue.


Alternatively, you could temporarily remove your anti-virus software from the Windows startup and then restart the OS as follows.

  • Now select your anti-virus utility, and press the Disable button.
  • The anti-virus software will no longer start when you reboot Windows.

Can’t open Task Manager? Don’t worry, we’ve got the right solution for you.


3. Switch Off the Windows Firewall

The Windows Firewall is another thing that can block MS Outlook. So switching the firewall off is another feasible resolution for Outlook error 0x800ccc0f. This is how you can configure the Windows Firewall settings in Windows 10.

  • Click the Cortana button on the taskbar to open that app.
  • Input the keyword ‘Windows Firewall’ in Cortana’s search box, and then select to open Windows Defender Firewall.

  • Click Turn Windows Firewall on or off to open the options shown directly below.

  • Select both the Turn off Windows Defender Firewall options there, and then press the OK button.
  • Alternatively, you can check if Outlook is permitted through the Windows Firewall by clicking Allow an app or feature through Windows Defender Firewall.

  • Press the Change settings button, and then scroll to Outlook in the Allowed apps list.
  • Select both Outlook‘s check boxes if they are not ticked.
  • Then press the OK button to confirm the new setting.

Want to check if Firewall is blocking your Outlook? Take a look at this article to find out how to do it.


4. Increase the Server Timeouts Setting in Outlook

Outlook includes a Server Timeouts bar that can fix interrupted connections when you drag it to a longer setting. As such, that is another option worth noting for fixing the Outlook error 0x800ccc0f. This is how you can increase the Server Timeouts setting in Outlook 2010.

  • First, open the Outlook software; and then select the File tab.
  • Press the Account Settings button and click Account Settings to open the E-mail Accounts window.
    Then press the Change > More Settings buttons to open the E-Mail Settings window.
  • Click the Advanced tab, and then can drag the Sever Timeouts bar to the far right.
  • Press the OK button to close the window.

Editor’s Note: This article continues on the next page. If you want to read more about Outlook, do check out our collection of guides.

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Editor's Note: This article was originally published in January 2018 and was revamped and updated in April 2020 for freshness, accuracy, and comprehensiveness.