How to fix error 0x800ccc0f in Outlook 2010/2013

Updated on September 27, 2018

Unexpected Outlook errors can turn into a nightmare for any user. This is because at first look, cryptic error codes can be very difficult to comprehend. And how can you expect one to solve an error that one can’t even understand? Outlook is often plagued by such complex issues that end up putting a halt to our daily activities. Thus, as its users, we should be aware of sudden errors that can crop up any day so that they can be resolved at the earliest.

This article highlights one such error that can prove to be quite puzzling. It has the error code ‘0x800ccc0f’ associated with it and herein we’re providing all information there is to know about it.

An introduction to error 0x800ccc0f

While using Outlook, if the SMTP-based email send / receive operation fails, users might see the following message:

"Sending / Receiving reported error (0x800CCC0F): The connection to the server was interrupted"

This error can arise without warning or any prior symptoms and hence can be very startling. To resolve it, you need to find the exact cause behind it and eliminate it completely.

Common reasons behind error 0x800ccc0f include:

  • Slow Internet connection or connectivity issues with the Exchange server
  • Firewall blocking MS Outlook outgoing and incoming messages
  • Incorrect Outlook profile settings or corrupted Outlook profile
  • Technical issue with the server settings
  • OST file corruption

Depending upon what the exact trigger behind the error is, one of the following solutions is sure to fix this issue.

Common ways to fix outlook error 0x800ccc0f

Note: After applying each of these fixes, try sending/receiving emails to make sure if the error is resolved or not.

1. Check for connectivity issues

The first step should be to check is your machine’s connection with the Exchange server. For this check both the Internet connection as well as the access gateway connection to the Exchange server. Make sure the configuration and settings are correct and that everything is in place.

2. Disable anti-virus and Windows firewall

In addition to Windows Firewall, your anti-virus program might also hamper the smooth working of incoming and outgoing emails. Thus, to check if this is the issue, disable your anti-virus. Also disable Windows Firewall as follows:

  1. Open Control Panel and go to Network Connections
  2. Right click on the internet connection you’re using and select ‘Properties’ from the pop-up menu
  3. Under the ‘Security’ tab, switch off the Firewall

To be sure that you’ve cleared all pathways for your incoming and outgoing emails, manually add the incoming POP server name and the outgoing SMTP server name to Outlook Email Accounts. For this:

  1. Open Outlook and select Tools -> E-mail Accounts.
  2. Select ‘View or change existing e-mail accounts’ and then click on Next.
  3. The E-mail Accounts dialog box will open. Click on Add -> POP3 -> Next.
  4. Type the correct information for your POP3 mail server, and then click Next -> Finish
  5. Check and rectify Outlook account settings

If this doesn’t work, proceed to the next fix.

3. Check Outlook profile settings

Check your default Outlook profile’s settings. If they are incorrect, correct them. If you’re not sure about what is wrong, delete the current default profile and create a new one. Then set the newly created Outlook profile as the default profile. 

4. Clear up suspicious emails from Outlook and Outlook Outbox

Sometimes, suspicious emails or emails with un-trusted attachments might be the real reason behind this error. If you think there are such emails within your Outlook inbox, delete them immediately. Also, if your Outlook outbox is overcrowded, clear it up (only the Outbox).

5. Verify your router’s MTU

The Maximum Transmission Unit (MTU) size of your router might also be creating this issue while sending / receiving particular mails. Check it and make changes to outgoing message sizes accordingly.

6. Start MS Outlook in Safe mode

Outlook Safe mode launches the application with basic settings, that is, no add-ins are loaded. If a faulty add-in is the culprit, this fix will help you point that out. To start Outlook in Safe mode:

  1. Open Run or type outlook.exe /safe in the Run dialog box
  2. Click OK

Try the send / receive operation. If this also doesn’t work, quit Outlook and move to the next fix.

7. Use Inbox Repair Tool

If you’ve reached this fix, it means that none of the above mentioned methods worked. Thus, damage or corruption in your Outlook data file (in this case, the OST) might be the real cause behind this error. To fix minor issues with Outlook data files, Microsoft offers inbuilt inbox repair utility ScanOST.exe. Locate this utility on your system and launch it. Then follow the instructions that it gives to repair Outlook OST file.

This method works for all minor problems within the OST file, however, it fails to achieve its purpose if there is severe corruption within the OST.

8. Convert OST to PST

If the above method also doesn’t solve the problem, the most recommended solution would be to convert OST file to PST format and then import the converted PST in Outlook. The tool we’re recommending to repair Outlook OST file by converting it to PST is Stellar Converter for OST. This tool extracts all objects within the OST file without changing their original format and converts them to PST format accurately.

Once you can access your data through Outlook, save it. Then delete the OST file and connect to the Exchange Server. As soon as the connection is established, the OST will be recreated again. And since you’ve already recovered the data in the previous OST, you can be sure that no data has been lost.

Wrapping it up

Hopefully, one of the 8 simple tricks mentioned above will help you overcome the Outlook error 0x800ccc0f. So don’t let nasty Outlook problems bog you down.

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