The error 0x800ccc0f is an Outlook error. It occurs when the SMTP-based email send/receive operation of the Outlook fails. A box pops up on your screen saying the message: “Sending/Receiving reported error (0x800ccc0f): The connection to the server was interrupted.”

Error 0x800ccc0fThis error shows no possible symptoms or any warning but occurs rather shockingly. There are various reasons behind this error. Some common causes of the 0x800ccc0f error are: slow internet connection, connectivity issues with the Exchange Server, firewall blocking MS Outlook outgoing and incoming messages, incorrect Outlook profile settings, corrupted Outlook profile, technical issues with the server settings and OST file corruption.

Such unexpected Outlook errors, however, can turn into nightmares. This is because the cryptic error codes it consists of are very difficult to comprehend. And if the error is so difficult to understand, it gets even more difficult to solve. This is why it is important to resolve errors like this at their earliest, so they don’t get more complex.

Following are some different methods for solving the 0x800ccc0f error. Try applying these methods onto your PC and check by sending/receiving emails if the error resolves.

Method 1: Check For Connectivity Issues

When you witness the 0x800ccc0f error, the first thing you should do is check your PC’s connection to the Exchange server. To do this, you have to check the Internet connection along with the access gateway connection to the Exchange server. When you’re checking both of these connections, make sure that the configuration and settings are correct. To run a reliable and authentic check, it is very important that everything is in place.

Method 2: Disable Anti-virus And Windows Firewall

Windows Firewall and the anti-virus program of your PC both can hamper the smooth work process of the incoming and outgoing emails. If you want to make sure that this is causing the error, disable your anti-virus. Also, disable the Windows firewall.

To disable Windows Firewall, follow these steps:

1) Open Control Panel.
2) Look for Network Connections and open it.
3) Then locate the network connection you’re currently using. Once you find it, right-click on it and choose Properties from the available options.
4) A window will open. Click on the Security tab.
5) Under the Security tab, go to Firewall and switch it off.

Now you have to make sure that you have cleared the pathway for all your incoming and outgoing emails. To do that, put in some manual effort and add the incoming POP server name and the outgoing SMTP server name to the Outlook Email Accounts.

To add these names to the Outlook Email Accounts, follow these steps:

1) Open Outlook.
2) Click on Tools.
3) Go to E-mail Accounts.
4) There select View or change existing e-mail accounts and click on Next.
5) That will open the E-mail Accounts dialog box. In that dialog box click on Add, then click on POP3 and finally click on Next.
6) Now click Next after typing the correct information for your POP3 mail server there.
7) Click on Finish.

After you’re done with that, check and rectify the Outlook account settings.

Method 3: Check Outlook Profile Settings

You should also check your Outlook profile’s default settings. If you see anything that is incorrect, correct it. If you don’t really know what’s wrong and what isn’t, delete the current default profile and create a fresh, new profile. Once you’ve made a new Outlook profile. Go to settings and set the new profile as the default profile.

Method 4: Clear Up Suspicious Emails From Outlook and Outlook Outbox

At times, the real reason behind this error is the suspicious emails or emails that have untrusted attachments. Go look in your Outlook inbox for such emails. If you think you have such un-trusted and suspicious emails in your inbox, then don’t wait for even a second and delete them immediately. Moreover, if your Outlook Outbox is very crowded, clear it up. Make sure you only clear the Outlook Outbox.

Method 5: Verify Your Router’s MTU

MTU stands for Maximum Transmission Unit. The Maximum Transmission Unit size of your router can also cause the 0x800ccc0f error while sending/receiving certain mails. You should check for any such issues. If you find something, then make changes to the size of your outgoing messages in accordance with what you found.

Method 6: Start MS Outlook In Safe Mode

Starting MS Outlook in Safe Mode will launch the application with all the basic settings. The basic settings is another description for no add-ins. When you start Outlook in Safe Mode, no add-ins load. So if the reason behind this error is a faulty add-in, this method will help you make sure and will point out the culprit.

To start Outlook in Safe Mode, follow these steps:
1) Open Run.
2) Type Outlook.exe / safe in the Run dialog box.
3) Click on OK.

Once MS Outlook opens up in Safe Mode, try the sending/receiving emails operation.

Method 7: Use Inbox Repair Tool

If none of the above, simpler methods worked, then it is very obvious that the damage or corruption in your Outlook data file is what is giving way to this error. In this case, this Outlook data file is the OST.

In order to fix minor issues with Outlook data files like this one, Microsoft has offered you a built-in inbox repair utility ScanOST.exe. You can easily locate this utility on your system. Once you locate it, all you have to do is launch it. You’ll be directed to simple on-screen instructions. Follow the instructions to repair the Outlook OST file.

All minor problems within the OST file can be resolved by this method.

Method 8: Convert OST to PST

Finally, the most recommended solution to the 0x800ccc0f error is to convert the OST file to the PST format. After the conversion, you’d have to import the converted PST format into Outlook. You can use the Stellar OST to PST Converter tool to repair the Outlook OST file. This tool is very reliable and delivers accurate conversion to PST format. It also extracts all the objects included in the OST file without altering their original format.

After you’ve accessed all your data from Outlook, don’t forget to save it. You can then delete the OST file and connect your PC to the Exchange Server. Once the connection establishes, the OST file will recreate. And no data will be lost, as you’re already recovered that.