This article describes issues that you may experience when you try to install Microsoft Operations Manager (MOM) 2005. Additionally, this article contains troubleshooting information to help you resolve or to work around these issues.

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MOM 2005 installation issues

You may experience one or more of the following issues when you try to install MOM 2005.

The MOM database files already exist

When you install MOM 2005 on a computer that previously hosted a MOM database, the Setup program may generate an error message. This behavior occurs if the following items have not been removed:

•	The previous MOM database
•	The EeaData.mdf file
•	The EeaLog.ldf file

To resolve this issue, remove the OnePoint database together with the files that relate to the database. Alternatively, you can select a different database instance to host the MOM database or you can modify the location of the database files and the transaction log files during the installation of MOM 2005.

An account exists that is named MOMService

When you install MOM 2005, the Setup program creates a group that is named MOMService. If an account that is named MOMService already exists in the domain, the MOM 2005 Setup program fails.

To resolve this issue, remove or rename the MOMService account. Then, install MOM 2005.

The Default Web Site is unavailable

The installation of MOM 2005 may unexpectedly stop. This issue occurs if the Microsoft Internet Information Services (IIS) Default Web Site is unavailable. You may experience this issue if the IIS Default Web Site has been removed or if IIS has been removed. The MOM 2005 Web console requires IIS together with the Default Web Site.

To resolve this issue, use one of the following procedures:

•	If IIS has been removed, reinstall IIS.
•	If the Default Web Site has been removed, re-create the Web Site by using the Internet Information Services (IIS) Manager tool.

The Check Prerequisites component is unable to locate ASP.NET

The Check Prerequisites component may generate an error message that states that ASP.NET is required. However, the error message may also state that ASP.NET is not enabled.

You may experience this issue on a Microsoft Windows 2000-based computer where the Microsoft .NET Framework was installed before IIS 5.0 was installed. On computers that are running Microsoft Windows 2000, install IIS 5.0 before you install the .NET Framework.

The name of the computer that is running Microsoft SQL Server has been changed

The prerequisite verification fails if the name of the computer that is running SQL Server is changed after SQL Server has been installed.

To resolve this issue, remove and then reinstall SQL Server.

SQL Server services are not correctly configured

The prerequisite verification fails if the following services are not configured for an automatic start:

•	The SQL Server (MSSQLSERVER) service
•	The SQL Server Agent (SQLSERVERAGENT) service

To resolve this issue, set the startup type for these services to Automatic. To view the Services dialog box to change the startup type for a service, click Start, click Run, type services.msc, and then click OK.

The Windows Installer service is disabled

The MOM 2005 Setup program is unable to install MOM 2005 if the Windows Installer service is disabled. Sometimes, administrators disable the Windows Installer service by using Group Policy.

To resolve this issue, enable the Windows Installer service in the Group Policy that applies to the computer on which you want to install MOM 2005. To view the Group Policy that controls the Windows Installer service, follow these steps:

1.	On a domain controller, start the Active Directory Users and Computers tool. To do this, click Start, click Run, type dsa.msc, and then click OK.
2.	Right-click the container that holds the computer on which you want to install MOM 2005, and then click Properties. For example, right-click the domain container or right-click an organizational unit.
3.	On the Group Policy tab, click the Group Policy that controls the Windows Installer service, and then click Edit.
4.	In the Group Policy Object Editor tool, expand Computer Configuration, expand Windows Settings, expand Security Settings, and then click System Services.
5.	In the right pane, double-click Windows Installer.
6.	View the security settings that appear on the Security Policy Setting tab.

Network COM+ is not installed

Network COM+ access enables remote access to the MOM Management server. The MOM 2005 prerequisite verification fails if you try to install MOM Management Server on a computer on which network COM+ access is not installed.

To resolve this issue, follow these steps:

1.	In Control Panel, click the Add or Remove Programs item.
2.	In the left pane, click Add/Remove Windows Components.
3.	In the Windows Components Wizard, click Application Server, and then click Details.
4.	Click to select the Enable network COM+ access check box, and then click OK.
5.	Follow the remaining steps in the Windows Components Wizard to enable network COM+ access.

MOM database connectivity fails

When you install MOM 2005 on a computer that is not connected to the network or on a computer that is in a workgroup, the MOM 2005 Setup program rolls back its changes if the program cannot connect to the MOM 2005 database.

To troubleshoot this issue, use the following procedures:

•	Try to connect to the computer that hosts the MOM 2005 database from the computer on which you want to install MOM 2005. Make sure that you do this before you restart the Setup program.
•	If the computer on which you want to install MOM 2005 is a member of a workgroup, run the Setup program by using the credentials of an account that has administrative rights in the domain in which the computer that is running SQL Server is located.
•	Empty the Domain Name System (DNS) resolver cache from the computer on which you want to install MOM 2005 before you restart the Setup program. To do this, type the following command at a command prompt: ipconfig /flushdns

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For a list of prerequisite checking errors together with the resolutions, see the following Microsoft Knowledge Base article: Additional information may be available in the MOM 2005 Troubleshooting Guide. To see the MOM 2005 Troubleshooting Guide, visit the following Microsoft Web site:Additionally, the MOMServer.log file logs any errors that occur during the Check Prerequisites part of the installation or during the installation of MOM 2005. This log file is located in the following folder:Note In this path, User_Profile represents the user profile of the user who started the MOM 2005 installation program.

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