Microsoft KB Archive/228475

= Event ID 115 error message starting SMTP Relay Host Service in Windows NT 4.0 Option Pack =

Article ID: 228475

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT version 4.0 Option Pack

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This article was previously published under Q228475



SYMPTOMS
This article is a consolidation of the following previously available article: 322023 When you try to start the SMTP Relay Host service in the Microsoft Management Console (MMC) for Windows NT Option Pack (NTOP), the following error message may be logged in the NT Application log:

Event ID: 115

Source: SMTPSVC

Description: Service could not bind instance 1. The data is in the error.



CAUSE
This behavior can occur if another service or program is using port 25. Some example scenarios include the following:
 * You may have Microsoft Internet Security and Acceleration (ISA) Server installed on the same computer, and it is set to publish SMTP.
 * Some third-party e-mail programs that send and receive mail on behalf of another program may be using this port.
 * Some antivirus programs listen over port 25 and scan all incoming and outgoing e-mail messages.



RESOLUTION
To determine whether another program or service is using port 25, type netstat -an at a command prompt, and then press ENTER.

A list of all available ports and their states (listening or active) is displayed. If there is an entry for port 25 and you cannot start the SMTPSVC Relay Host service, this is likely the program that is causing the problem. Stop the appropriate service and then try to start the SMTP Relay Host service.



MORE INFORMATION
Transport Control Protocol (TCP) ports cannot be multiplexed or used more than one time in a session. You must stop one service from using a port before another service or program can use it.

Keywords: kbprb KB228475

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