Event ID:12018
Symbolic Name:STARTTLSCertificateExpiresSoon
Message:The STARTTLS certificate will expire soon: subject: %1, hours remaining: %2. Run the New-ExchangeCertificate cmdlet to create a new certificate.

This Warning event indicates that the certificate that is used for Transport Layer Security (TLS) on this computer will expire soon.

User Action

To resolve this warning, you must use the New-ExchangeCertificate cmdlet to create a new TLS certificate for the computer that returned this Error event. For more information, see Creating a Certificate or Certificate Request for TLS.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.

Currently there are no Microsoft Knowledge Base articles available for this specific error or event message. For information about other support options you can use to find answers online, see