The operation of Horizon depends on several services that run on a Connection Server host.
| Service Name | Startup Type | Description |
|---|---|---|
| Horizon Blast Secure Gateway | Automatic | Provides secure HTML Access and Blast Extreme services. This service must be running if clients connect to Connection Server through the Blast Secure Gateway. |
| Horizon Connection Server | Automatic | Provides connection broker services. This service must always be running. If you start or stop this service, it also starts or stops the Framework, Message Bus, Security Gateway, and Web services. This service does not start or stop the VDMDS service or the Horizon Script Host service. |
| Horizon Framework Component | Manual | Provides event logging, security, and COM+ framework services. This service must always be running. |
| Horizon Message Bus Component | Manual | Provides messaging services between the Horizon components. This service must always be running. |
| Horizon PCoIP Secure Gateway | Manual | Provides PCoIP Secure Gateway services. This service must be running if clients connect to Connection Server through the PCoIP Secure Gateway. |
| Horizon Script Host | Disabled | Provides support for third-party scripts that run when you delete virtual machines. This service is disabled by default. You should enable this service if you want to run scripts. |
| Horizon Security Gateway Component | Manual | Provides common gateway services. This service must always be running. |
| Horizon Web Component | Manual | Provides web services. This service must always be running. |
| VDMDS | Automatic | Provides Horizon LDAP services. This service must always be running. During upgrades of Horizon, this service ensures that existing data is migrated correctly. |
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