How To Repair: MS Outlook Error Code 0x800cc0f

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0×800ccc0f Error message “Your server has unexpectedly disconnected” when sending an SMTP e-mail message

This problem may seem to arise out of nowhere. One day everything is fine, the next day Microsoft Outlook complains about the 0×800ccc0f error when trying to send emails.

It is important that Microsoft products conflict with Microsoft products, such as MS Window Firewall, which blocks MS Outlook. Check if any of the following scenarios apply to you and follow the steps to solve the problem.

The following message is displayed each time Outlook is started:

“Task ‘Synchronizing subscribed folders for [email protected].’ reported error (0x800CC0F) outlook cannot synchronize subscribed folders TCP/IP connection was unexpectedly terminated by the server. If you continue to receive this message, contact your server administrator.”

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How can this error be corrected?

Disabling the Windows firewall / anti-malware firewall


To disable the Windows firewall:

  1. Open the Control Panel (Start > Control Panel).
  2. Open network connection
  3. Right-click on the Internet connection you are using (local area network, wireless or GreenNet switched).
  4. Select “Properties” from the menu.
  5. Go to the “Security” tab and disable the firewall.

If the problem persists, you must manually add the POP servers. To do this, follow the steps below:

  1. Launch Outlook.
  2. On the Tools menu, click Email Accounts.
  3. click View or edit existing email accounts, then click Next.
  4. In the Email Accounts dialog box, click Add.
  5. click on POP3, then click on Next.
  6. Enter the correct information for your POP3 mail server, then click Next.
  7. click on Finish.

Make sure you are connected to the Internet.

First of all, make sure that your computer sends / receives data over the Internet or not. For that:

Open a browser window and enter the URL of a website. When it opens, it means that your computer is connected.
If this is not the case, you must solve network connectivity problems by right-clicking on your Wi-Fi connection or Ethernet cable connection signal and clicking Troubleshooting in the context menu.

Start Outlook in safe mode

If you start Outlook in safe mode, disable add-ins and start Outlook with default settings only. If defective add-ins are the cause of the problem, this can solve the problem. For that:

Open the search in the “Start” menu or enter outlook.exe /safe in the “Search” field and click OK. For Outlook 2003 and earlier versions, you must enter it in the Run dialog box.

Microsoft has confirmed that this is a problem in the Microsoft products listed at the beginning of this article. This problem has been fixed for the first time in Microsoft Windows 2000 Service Pack 4.

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