-->![Gateway Gateway](/uploads/1/2/6/2/126261675/974251390.png)
Gateway servers are used to enable agent-management of computers that are outside the Kerberos trust boundary of management groups, such as in a domain that is not trusted. The gateway server acts as a concentration point for agent-to-management server communication. Agents in domains that are not trusted communicate with the gateway server and the gateway server communicates with one or more management servers. Because communication between the gateway server and the management servers occurs over only one port (TCP 5723), that port is the only one that has to be opened on any intervening firewalls to enable management of multiple agent-managed computers. Multiple gateway servers can be placed in a single domain so that the agents can failover from one to the other if they lose communication with one of the gateway servers. Similarly, a single gateway server can be configured to failover between management servers so that no single point of failure exists in the communication chain.
Because the gateway server resides in a domain that is not trusted by the domain that the management group is in, certificates must be used to establish each computer's identity, agent, gateway server, and management server. This arrangement satisfies the requirement of Operations Manager for mutual authentication.
You must ensure that your server meets the minimum system requirements for System Center - Operations Manager. For more information, see System Requirements for System Center Operations Manager.
Note
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If your security policies restrict TLS 1.0 and 1.1, installing a new Operations Manager 2016 gateway server role will fail because the setup media does not include the updates to support TLS 1.2. The only way you can install this role is by enabling TLS 1.0 on the system, apply Update Rollup 4, and then enable TLS 1.2 on the system. This limitation does not apply to Operations Manager version 1801.
How to deploy a gateway server
- Request certificates for any computer in the agent, gateway server, management server chain.
- Import those certificates into the target computers by using the MOMCertImport.exe tool.
- Distribute the Microsoft.EnterpriseManagement.GatewayApprovalTool.exe to the management server.
- Run the Microsoft.EnterpriseManagement.GatewayApprovalTool.exe tool to initiate communication between the management server and the gateway
- Install the gateway server.
Preparing for installation
Before you start
- Deployment of gateway servers requires certificates. You need to have access to a certification authority (CA). This can be a public CA such as VeriSign, or you can use Microsoft Certificate Services. This procedure provides the steps to request, obtain, and import a certificate from Microsoft Certificate Services.
- Reliable name resolution must exist between the agent-managed computers and the gateway server and between the gateway server and the management servers. This name resolution is typically done through DNS. However, if it is not possible to get proper name resolution through DNS, it might be necessary to manually create entries in each computer's hosts file.NoteThe hosts file is located in the Windowssystem32drivers directory, and it contains directions for configuration.
Obtaining computer certificates from Microsoft Certificate Services
For more information, see Active Directory Certificate Services
Distributing the Microsoft.EnterpriseManagement.GatewayApprovalTool
The Microsoft.EnterpriseManagement.GatewayApprovalTool.exe tool is needed only on the management server, and it only has to be run once.
To copy Microsoft.EnterpriseManagement.GatewayApprovalTool.exe to management servers
- From a target management server, open the Operations Manager installation media SupportTools (amd64 or x86) directory.
- Copy the Microsoft.EnterpriseManagement.GatewayApprovalTool.exe from the installation media to the Operations Manager installation directory.
Registering the gateway with the management group
This procedure registers the gateway server with the management group, and when this is completed, the gateway server appears in the Discovered Inventory view of the management group.
To run the gateway approval tool
- On the management server that was targeted during the gateway server installation, log on with the Operations Manager Administrator account.
- Open a command prompt, and navigate to the Operations Manager installation directory or to the directory that you copied the Microsoft.EnterpriseManagement.gatewayApprovalTool.exe to.
- At the command prompt, run
Microsoft.EnterpriseManagement.gatewayApprovalTool.exe /ManagementServerName=<managementserverFQDN> /GatewayName=<GatewayFQDN> /Action=Create
NoteTo prevent the gateway server from initiating communication with a management server, include the /ManagementServerInitiatesConnection parameter on the command line. - If the approval is successful, you will see
The approval of server <GatewayFQDN> completed successfully.
- If you need to remove the gateway server from the management group, run the same command, but substitute the
/Action=Delete
flag for the/Action=Create
flag. - Open the Operations console to the Monitoring view. Select the Discovered Inventory view to see that the gateway server is present.
Installing gateway server
This procedure installs the gateway server. The server that is to be the gateway server should be a member of the same domain as the agent-managed computers that will be reporting to it.
Tip
An installation will fail when starting Windows Installer (for example, installing a gateway server by double-clicking MOMGateway.msi) if the local security policy User Account Control: Run all administrators in Admin Approval Mode is enabled.
To run Operations Manager Gateway Windows Installer from a Command Prompt window
- On the Windows desktop, click Start, point to Programs, point to Accessories, right-click Command Prompt, and then click Run as administrator.
- In the Administrator: Command Prompt window, navigate to the local drive that hosts the Operations Manager installation media.
- Navigate to the directory where the .msi file is located, type the name of the .msi file, and then press ENTER.
![Gateway Gateway](/uploads/1/2/6/2/126261675/974251390.png)
To install the gateway server
- Log on to the gateway server with Administrator rights.
- From the Operations Manager installation media, start Setup.exe.
- In the Install area, click the Gateway management server link.
- On the Welcome screen, click Next.
- On the Destination Folder page, accept the default, or click Change to select a different installation directory, and then click Next.
- On the Management Group Configuration page, type the target management group name in the Management Group Name field, type the target management server name in the Management Server field, check that the Management Server Port field is 5723, and then click Next. This port can be changed if you have enabled a different port for management server communication in the Operations console.
- On the Gateway Action Account page, select the Local System account option, unless you have specifically created a domain-based or local computer-based gateway Action account. Click Next.
- On the Microsoft Update page, optionally indicate if you want to use Microsoft Update, and then click Next.
- On the Ready to Install page, click Install.
- On the Completing page, click Finish.
To Install the gateway server from the Command Prompt
- Log on to the gateway server with Administrator rights.
- Open the Command Prompt window by using the Run as Administrator option.
- Run the following command, where pathDirectory is the location of the Momgateway.msi, and pathLogs is the location where you want to save the log file. Momgateway.msi can be found in the Operations Manager installation media.
Importing certificates with the MOMCertImport.exe tool
Perform this operation on each gateway server, management server, and computer that will be agent-managed and that is in a domain that is not trusted.
To import computer certificates by using MOMCertImport.exe
- Copy the MOMCertImport.exe tool from the installation media SupportTools (amd64 or x86) directory to the root of the target server or to the Operations Manager installation directory if the target server is a management server.
- As an administrator, open a Command Prompt window and change the directory to the directory where MOMCertImport.exe is, and then run
momcertimport.exe /SubjectName <certificate subject name>
. This makes the certificate usable by Operations Manager.
Configuring gateway servers for failover between management servers
Although gateway servers can communicate with any management server in the management group, this must be configured. In this scenario, the secondary management servers are identified as targets for gateway server failover.
Use the Set-SCOMParentManagementServer command in the Operations Manager shell, as shown in the following example, to configure a gateway server to failover to multiple management servers. The commands can be run from any Command Shell in the management group.
To configure gateway server failover between management servers
- Log on to the management server with an account that is a member of the Administrators role for the management group.
- On the Windows desktop, click Start, point to Programs, point to System Center Operations Manager, and then click Command Shell.
- In Command Shell, run the following commands:$GatewayServer = Get-SCOMGatewayManagementServer -Name 'ComputerName.Contoso.com'$FailoverServer = Get-SCOMManagementServer -Name 'ManagementServer.Contoso.com','ManagementServer2.Contoso.com'Set-SCOMParentManagementServer -GatewayServer $GatewayServer-FailoverServer $FailoverServer
To chain multiple gateway servers
It is sometimes necessary to chain multiple gateways together in order to monitor across multiple untrusted boundaries. This topic describes how to chain multiple gateways together.
Note
You should install one gateway at a time and verify that each newly installed gateway is configured correctly before adding another gateway in the chain.
- On the management server that was targeted during the gateway server installation, run the Microsoft.EnterpriseManagement.GatewayApprovalTool.exe tool to initiate communication between the management server and the gateway.
- Open a command prompt, and navigate to the Operations Manager installation directory or, and then run the following:
Microsoft.EnterpriseManagement.gatewayApprovalTool.exe /ManagementServerName=<managementserverFQDN> /GatewayName=<GatewayFQDN> /Action=Create
- Install the gateway server on a new server.
- Configure the certificates between gateways in the same way that you would configure certificates between a gateway and a management server. The Health Service can only load and use a single certificate. Therefore, the same certificate is used by the parent and child of the gateway in the chain.
Next steps
- See Distributed Deployment of Operations Manager to understand the sequence and steps for installing the Operations Manager server roles across multiple servers in your management group.
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