How to Fix Microsoft Outlook Error 0x800ccc15

This guide will show you How to Fix Microsoft Outlook Error 0x800ccc15. When you attempt to send or receive email, you see one of the following error messages. The message could not be sent to the SMTP server. The transport error code was 0x800ccc15.

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.

This issue may occur if one of the following scenarios is true:

  • Your Outlook might be disconnected or not connected to Internet.
  • Incorrect settings of Outlook mail account.
  • Incomplete installation of Outlook
  • Incorrect configuration of Antivirus software
  • When your Outlook user profile is damaged.
  • Corrupt or damaged PST files
  • If Outlook email item on your POP3 server is damaged.
  • When Outlook is removed or installation of Outlook is damaged.
  • This occurs when port 25 is blocked by ISP.

How to Fix Microsoft Outlook Error 0x800ccc15?

Follow the below resolution steps one by one each and check if the error gets fix after each step. If the error remains, you can proceed with the further resolution 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 state if something goes wrong.

Step 1: 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 2: 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 3:  Create a new Outlook profile to fix error 0x800ccc15.

You can also try creating a new Outlook profile in order to fix the Outlook error 0x800ccc15. Refer the below link to perform the same.

Learn 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.