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.

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.

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.

How to Fix Microsoft Outlook Error 0x800ccc15

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
AOL pop.aol 110 OFF OFF ON
AT&T Yahoo pop.att.yahoo.com 995 OFF ON ON
Charter pop.charter.net 110 OFF OFF ON
Comcast mail.comcast.net 995 OFF ON ON
Cox pop.[insert region].cox.net 110 OFF OFF OFF
Gmail pop.gmail.com 995 OFF ON ON
Juno pop.juno.com 110 OFF OFF OFF
Microsoft Live pop3.live.com 995 OFF ON ON
Netscape pop.3.isp.netscape.com 110 OFF OFF ON
Netzero pop.netzero.com 110 OFF OFF ON
Pacbell pop.att.yahoo.com 995 OFF ON ON
PeoplePC pop.peoplepc.com 110 OFF OFF ON
Qwest pop.[enter state ID].qwest.net 110 OFF OFF OFF
Rogers pop.broadband.rogers.com 110 OFF OFF ON
SBCGlobal pop.att.yahoo.com 995 OFF ON ON
Swbell pop.att.yahoo.com 995 OFF ON ON
Verizon incoming.verizon.net 110 OFF OFF ON
Yahoo pop.mail.yahoo.com 110 OFF OFF OFF

Outgoing Mail (SMTP) server names and settings:

Provider Name Server Name Port SPA AuthRequired Encryption
AOL smtp.aol.com 587 OFF ON None
AT&T Yahoo smtp.att.yahoo.com 465 OFF ON SSL
Charter smtp.charter.net 25 OFF ON None
Comcast smtp.comcast.net 587 OFF ON TLS
Cox smtp.[insert region].cox.net 25 OFF OFF None
Gmail smtp.gmail.com 587 OFF ON TLS
Juno authsmtp.juno.com 587 OFF OFF None
Microsoft Live smtp.live.com 587 OFF ON TLS
Netscape smtp.isp.netscape.com 25 OFF OFF None
Netzero authsmtp.netzero.com 25 OFF ON None
Pacbell smtp.att.yahoo.com 465 OFF ON SSL
PeoplePC smtpauth.peoplepc.com 587 OFF ON None
Qwest pop.[enter state ID].qwest.net 25 OFF OFF None
Rogers smtp.broadband.rogers.com 587 OFF ON None
SBCGlobal smtp.att.yahoo.com 465 OFF ON SSL
Swbell smtp.att.yahoo.com 465 OFF ON SSL
Verizon outgoing.verizon.net 25 OFF ON None
Yahoo smtp.mail.yahoo.com 25 OFF OFF None

Step 2: Check your antivirus manufacturer’s website for additional suggestions or Disable the antivirus software. And Disable the firewall in router.

If you found outlook is working fine after disable the antivirus 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.
Avast http://www.avast.com/uninstall-utility
AVG http://www.avg.com/us-en/utilities
Avira http://www.avira.com/en/support-for-free-knowledgebase-detail/kbid/88
BitDefender http://kb.bitdefender.com/site/article/333/
BullGuard http://www.bullguard.com/support/product-guides/bullguard-internet-security-guides-12/getting-started/uninstalling-bullguard.aspx
CA Antivirus see Total Defense Anti-Virus
Comodo Internet Security https://support.comodo.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=298
CounterSpy http://www.google.com/#q=counterspy+uninstall
Cyber Defender Early Detection Center http://www.ustechsupport.com/faq.html#q4
Dr. Web https://support.drweb.com/support_wizard/?lng=en
(Only registered Dr. Web users can access support content)
eScan http://www.microworldsystems.com/download/tools/esremove.exe
ESET http://kb.eset.com/esetkb/index?page=content&id=SOLN2788
FRISK F-PROT Antivirus for Windows http://www.f-prot.com/support/windows/fpwin_faq/25.html
F-Secure ftp://ftp.f-secure.com/support/tools/uitool/UninstallationTool.zip
http://community.f-secure.com/t5/Security-for-PC/How-do-I-uninstall-the-product/ta-p/15384
G Data https://www.gdatasoftware.co.uk/?eID=PushFile&dl=f4b2f2fd23%3AAFEIBgU%3D
Kaspersky http://support.kaspersky.com/common/service.aspx?el=1464
K7 Total Security http://www.k7computing.com/en/tools/K7RT.exe
LavaSoft http://www.lavasoftsupport.com/index.php?showtopic=28
Malwarebytes http://www.malwarebytes.org/mbam-clean.exe
McAfee http://download.mcafee.com/products/licensed/cust_support_patches/MCPR.exe
Microsoft Security Essentials http://support.microsoft.com/kb/2435760
Norman Virus Control/Norman Security Suite http://www.norman.com/support/support_issue_archive/67798/en
Norton (Symantec) ftp://ftp.symantec.com/public/english_us_canada/removal_tools/Norton_Removal_Tool.exe
Norton Security Scan ftp://ftp.symantec.com/public/english_us_canada/removal_tools/NSSRT.exe
Panda http://www.pandasecurity.com/resources/sop/UNINSTALLER_08.exe
Panda Cloud Internet Protection http://www.pandasecurity.com/resources/sop/Cloud_AV_Uninstaller.exe
Pareto Logic http://www.paretologic.com/resources/help/xoftspyse/195.htm
Sophos http://www.sophos.com/support/knowledgebase/article/11019.html
Spybot Search & Destroy http://www.safer-networking.org/faq/how-to-uninstall-2/
Total Defense Anti-Virus (formerly CA Anti-Virus)  http://totaldefense.iyogi.com/?p=368
Trend Micro http://esupport.trendmicro.com/solution/en-us/1056551.aspx
Trend Micro Titanium http://esupport.trendmicro.com/solution/en-us/1059018.aspx
Trend Micro Worry-Free Business Security Agent http://esupport.trendmicro.com/solution/en-us/1057237.aspx
Vipre (Sunbelt Software) http://kb.threattracksecurity.com/articles/SkyNet_Article/How-to-Uninstall-VIPRE-Antivirus-and-VIPRE-Internet-Security
Webroot http://www.webroot.com/prodCheck/?pc=64150&origrc=1&oc=221&mjv=7&mnv=0&rel=6&bld=38&lang=en&loc=AUS&kc=ppc%60lkik^^afhgpewgfa&opi=2&omj=6&omn=1&osl=en&errid
Windows Defender http://kb.eset.com/esetkb/index?page=content&id=SOLN2390
Windows Live OneCare http://download.microsoft.com/download/4/c/b/4cb845e7-1076-437b-852a-7842a8ab13c8/OneCareCleanUp.exe
Windows Security Essentials http://support.microsoft.com/kb/2435760
Zone Alarm http://download.zonealarm.com/bin/free/support/download/clean.exe

Step 3:  Create a new E-mail profile.

Conclusion:

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