Before you perform the procedures in this topic, confirm the following:

• You have read System Requirements for RPC over HTTP on Exchange Server 2003.
  
• You have one or more back-end Exchange servers.
  
• You have one or more global catalog servers.
  
• You have one of the following scenarios:
  
  • The back-end role and the global catalog role are applied on separate servers.
    
  • The back-end role and the global catalog role are applied on the same server.
    

    Note:
    If your back-end server is also a domain controller, it is recommended that you make this domain controller a global catalog server. If an RPC over HTTP back-end server is a domain controller but is not a global catalog server, you can experience problems with connectivity to this server.

• You do not have a front-end server.
  
• You are running Exchange Server 2003 SP1 on all of your Exchange servers.
  

Note:
The Exchange server role and the global catalog server role can be applied on separate servers, or you can have a single server that is both an Exchange back-end server and a global catalog server.

• If you are deploying RPC over HTTP for the first time on Exchange Server 2003 SP1, and you do have a front-end server in your organization, see How to Deploy RPC over HTTP for the First Time on Exchange Server 2003 SP1 (Front-End/Back-End Scenario)
  
• If you are deploying RPC over HTTP for the first time on Exchange Server 2003 and have not installed Service Pack 1 on your Exchange servers, see one of the following topics:
  
  • How to Deploy RPC over HTTP for the First Time on Exchange Server 2003, Front-End/Back-End Scenario
    
  • How to Deploy RPC over HTTP for the First Time on Exchange Server 2003, Front-End/Back-End Scenario, Back End on Global Catalog Server
    
  • How to Deploy RPC over HTTP for the First Time on Exchange Server 2003, No Front-End Server
    
  • How to Deploy RPC over HTTP for the First Time on Exchange Server 2003, No Front-End Server, Back-End on Global Catalog Server
    
• If you have already deployed RPC over HTTP in an Exchange Server 2003 organization and are upgrading that organization from Exchange Server 2003 to Exchange 2003 SP1, see How to Upgrade an Exchange Server 2003 RPC over HTTP Deployment to Exchange Server 2003 SP1
  
• If you want to add another Exchange Server 2003 back-end server to your organization after you have deployed RPC over HTTP, see Adding a Back-End Server to an RPC over HTTP Deployment
  
• If you want help with troubleshooting RPC over HTTP communications, see Troubleshooting RPC over HTTP Communications.