How to Fix Outlook Unknown Error 0x800CCC7D

This guide will show you How to Fix Outlook Unknown Error 0x800CCC7D. This behaviour can occur because the outgoing SMTP server does not support secure connections. You have SSL enabled and your mail server doesn’t support SSL. Disable SSL in Tools->Email Accounts; double click on the Accounts, More Settings and Advanced tab.  When you have an Outlook account that is set up to use Secure Sockets Layer (SSL) and you try to send an SMTP e-mail message, you may receive the following error message: Unknown Error 0x800CCC7D.

RECOMMENDED: Fix this issue in 3 simple steps. Takes only 2 minutes.
1) Download repair utility.
2) Install program and click Scan button.
3) Click Fix Errors button when scan is completed.
4) Restart your computer.

How to Fix Outlook Unknown Error 0x800CCC7D?

Follow the below resolution steps one by one and check if the Outlook works fine after each step. If the error remains, you can continue with the further steps.

Warning : Before making any changes in your computer, I suggest you to create a System Restore point  so that you can restore back your computer to previous working stat if something goes wrong. 

Step 1: Disabled the Secure Sockets Layer (SSL)

  1. Open Outlook and click Tools.
  2. In the Tools menu, select Account Settings.

How to Fix Outlook Unknown Error 0x800CCC7D3. Select your email account from the list and click the Change. The email settings are displayed.

How to Fix Outlook Unknown Error 0x800CCC7D 4. Click the More Settings… button and select the advanced tab.

How to Fix Outlook Unknown Error 0x800CCC7D

5. Change the Incoming server (POP3) to use port 110.
6. Change the Outgoing (SMTP) to use port 25.
7. If enabled, remove the checkmarks next to This server requires an encrypted connection (SSL).

8. Select the Outgoing tab and place a check next to My outgoing server (SMTP) requires authentication.

How to Fix Outlook Unknown Error 0x800CCC7D

9. Click OK to update your settings.

How to Fix Outlook Unknown Error 0x800CCC7D

10. Click Next and then click Finish.

Step 2: Make sure that your Outlook email account settings are correct.

We recommend that you contact your Internet service provider (ISP) for information about the exact incoming and outgoing mail server names and settings that you should use when you configure your Internet email account in Outlook. The list provided here contains information only for some Internet service providers in the United States and may not be up to date.

Incoming Mail (POP3) server names and settings:

Provider Name Server Name Port SPA SSL AuthRequird
AT&T Yahoo 995 OFF ON ON
Charter 110 OFF OFF ON
Comcast 995 OFF ON ON
Cox pop.[insert region] 110 OFF OFF OFF
Gmail 995 OFF ON ON
Juno 110 OFF OFF OFF
Microsoft Live 995 OFF ON ON
Netscape 110 OFF OFF ON
Netzero 110 OFF OFF ON
Pacbell 995 OFF ON ON
PeoplePC 110 OFF OFF ON
Qwest pop.[enter state ID] 110 OFF OFF OFF
Rogers 110 OFF OFF ON
SBCGlobal 995 OFF ON ON
Swbell 995 OFF ON ON
Verizon 110 OFF OFF ON
Yahoo 110 OFF OFF OFF

Outgoing Mail (SMTP) server names and settings:

Provider Name Server Name Port SPA AuthRequired Encryption
AOL 587 OFF ON None
AT&T Yahoo 465 OFF ON SSL
Charter 25 OFF ON None
Comcast 587 OFF ON TLS
Cox smtp.[insert region] 25 OFF OFF None
Gmail 587 OFF ON TLS
Juno 587 OFF OFF None
Microsoft Live 587 OFF ON TLS
Netscape 25 OFF OFF None
Netzero 25 OFF ON None
Pacbell 465 OFF ON SSL
PeoplePC 587 OFF ON None
Qwest pop.[enter state ID] 25 OFF OFF None
Rogers 587 OFF ON None
SBCGlobal 465 OFF ON SSL
Swbell 465 OFF ON SSL
Verizon 25 OFF ON None
Yahoo 25 OFF OFF None

Step 3: Check your antivirus manufacturer’s website for additional suggestions, disable the antivirus software and disable the firewall in router.

If the Outlook works fine after disabling the Anti-Virus software, highly recommended to uninstall the same using their removal tool and reinstall it.

List of manual antivirus uninstallers

  1. Click the link associated with the antivirus software currently installed on your system and follow the prompts or instructions on the website.
  2. Once uninstallation is complete, you will need to restart your computer.
CA Antivirus see Total Defense Anti-Virus
Comodo Internet Security
Cyber Defender Early Detection Center
Dr. Web
(Only registered Dr. Web users can access support content)
FRISK F-PROT Antivirus for Windows
G Data
K7 Total Security
Microsoft Security Essentials
Norman Virus Control/Norman Security Suite
Norton (Symantec)
Norton Security Scan
Panda Cloud Internet Protection
Pareto Logic
Spybot Search & Destroy
Total Defense Anti-Virus (formerly CA Anti-Virus)
Trend Micro
Trend Micro Titanium
Trend Micro Worry-Free Business Security Agent
Vipre (Sunbelt Software)
Windows Defender
Windows Live OneCare
Windows Security Essentials
Zone Alarm

Step 4:  Create a new E-mail profile to fix error 0x800CCC7D.

If none of the above resolution steps works, you can try creating a new Outlook profile that helps to fix the unknown error. Refer the below link to perform the same.

How to create new profile in Outlook?


If above steps did not help you to resolve the issues, you may have to create new outlook profile and reconfigure email settings. In addition, try creating new Windows user account as well. Hope this will help you to fix the issues. If the error remains, you have to contact your ISP for further assistance. For further support, leave comments or ask more on Forum.

Arun Prabhakar

Arun Prabhakar immensely interested in following Windows and other technology developments. Being passionate Windows blogger, he loves to help others on fixing their computer issues.