Event ID - 115

Event Id115
SourceSMTPSVC
DescriptionThe service could not bind instance <instance number>. The data is the error code. For additional information specific to this message please visit the Microsoft Online Support site located at: http://www.microsoft.com/contentredirect.asp
Event InformationCause:
If two services use the same TCP port, this problem occurs.

Resolution:
Check what all services or programs are using this port using, netstat -an. Decide which service is required.
Reference LinksXFOR: Event ID 115 Error Message Starting SMTP Relay Host Service

XFOR: Event ID 115 When Configuring More than One Virtual Server on Same IP Address

Event ID 115 Message Occurs When You Start SMTP Service

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