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Main Causes and Possible Resolution of Error 12014 in Exchange 2007

Paul Ryan | July 14th, 2015 | exchange 2007

Event ID 12014 indicates a problem that arises at the time of loading certificate when connection is established between SMTP (Simple Mail Transfer Protocol) and TLS (Transport Layer Security) for authentication.

Symptom of Event ID 12014

  • SMTP server fails to establish connection with the TLS

This problems occurs due to the following reasons:

  • SMTP certificate may be disabled.
  • The server is unable to reflect the certificate with FQDN (Fully Qualified Domain Name) that has been defined on send connector and receive connector of Exchange Server 2007.


Possible Remedies:

  • Check the available certificate using PowerShell cmdlet Get-ExchangeCertificate|FL*command will return the list of certificate available.
  • Configuration should be made on send and receive connector installed using PowerShell cmdlet

Get-SendConnector | FL name, fqdn, object class    

Get-RecieveConnector | FL name, fqdn, object class

  • Check that the FQDN server have CertificateDomains parameter in list:
  1. If it contain CertificateDomains then we have to enable it for SMTP service through the following PowerShell command.

Enable-ExchangeCertificate -Thumbprint 2afd36617915932ad096c48eb3b847fc9564856 -Services “SMTP”

  1. If it does not contain CertificateDomains parameter in list then a new certificate is generated. Using PowerShell command will generate a certificate request.

New-ExchangeCertificate -GenerateRequest-SubjectName “C=NL, O=Test,” –IncludeAcceptedDomains –DomainName –Path c:\certificates\

  • Restart the Exchange server again.


The goal is to rectify the problem emerging at the time of loading certificate in EX2007. The certificatedomains parameter which reflect the FQDN server are either contained in the list but not enabled or not contained in the list and have to generate new certificate. So that at the time of establishing connection between SMTP and TLS, loading of certificate will not generate problem. IN case if you are still facing the issue, please comment, we will try our best to resolve your issue.

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Paul Ryan

Paul Ryan is a technical blogger and he’s passionate about writing technical blogs and covering all popular issues related to Exchange server / Outlook apps. He is MCSE certified and putting all his knowledge and experience in providing solutions to the Exchange users/administrators.