Error code 0x800ccc0f commonly occurs when sending or receiving SMTP-based emails, as Outlook is unable to connect to the mail server. This issue can arise in MS Outlook versions 2019, 2016, 2013, 2010, and 2007 due to a connection disruption caused by firewall settings or a corrupted OST file. In this guide, we outline a few manual methods to troubleshoot the Outlook sending error 0x800ccc0f and restore server connectivity. Additionally, we discuss an effective solution to recover mailbox items if the error is due to a damaged OST file.
The error 0x800ccc0f typically appears when sending or receiving emails in Outlook. This unexpected error can occur suddenly and become a major inconvenience for any user. At first glance, such cryptic error codes can be hard to understand.
Outlook is often affected by these complex issues, which can disrupt email communication. However, it is crucial for users to be aware of such errors so they can be resolved promptly.
In this article, we discuss the error code ‘0x800ccc0f’, its possible causes, and the methods to troubleshoot and resolve it. By following this guide, you can fix the 0x800ccc0f error in Outlook and restore normal email functionality.
About Outlook Error 0x800ccc0f
When using Outlook, if the SMTP-based email send/receive operation fails, users may encounter the following error message:
“Sending / Receiving reported error (0x800CCC0F): The connection to the server was interrupted. If the problem persists, contact your server administrator or Internet Service Provider (ISP).
This error can occur suddenly, without any prior warning or symptoms, making it quite startling. To resolve the 0x800ccc0f error, you must identify the underlying cause and completely eliminate it.
Method 1: Check for Connectivity Issues
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First, verify the machine’s connection to the Exchange server. Ensure both the internet and access gateway connections are properly configured.
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Method 2: Disable Antivirus and Firewall
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Both antivirus programs and firewalls can block email communication. To troubleshoot, temporarily disable your antivirus and Windows Firewall, following these steps:
- Open Settings > Update & Security > Windows Security.
- Go to Firewall & Network Protection and disable the firewall for all networks.
- If disabling the firewall resolves the error, add the correct POP and SMTP server information in Outlook.
Method 3: Check Outlook Profile Settings
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If your default Outlook profile settings are incorrect, correct or recreate the profile. Deleting the existing profile and creating a new one might resolve the error.
Method 4: Clear Suspicious Emails from Outlook
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Emails with suspicious attachments or a cluttered Outbox can trigger the error. Delete any questionable emails or clear the Outbox, then try sending an email again.
Method 5: Verify Router’s MTU Settings
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The router’s Maximum Transmission Unit (MTU) size may affect email transmission. Check the MTU settings and adjust as needed, or contact your router manufacturer for assistance.
Method 6: Start Outlook in Safe Mode
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Launch Outlook in Safe Mode by pressing Windows key + R, typing outlook.exe /safe, and pressing Enter. This disables add-ins, which may be the cause of the error. If this resolves the issue, identify and disable the faulty add-in.
Method 7: Use the Inbox Repair Tool
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If none of the previous methods work, damage to your Outlook data file (OST) may be the cause. Use the built-in Inbox Repair Tool (ScanPST.exe) to scan and repair the OST file.
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Method 8: Convert OST to PST Using Stellar Converter for OST
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If the error persists, convert the OST file to PST using Stellar Converter for OST. This tool can recover deleted mailbox items and fix sending/receiving errors by converting OST to PST. After conversion, you can delete the damaged OST file and reconnect to the Exchange server.
