The Core Technologies Blog

Professional Software for Windows Services / 24×7 Operation

Essential Windows Services: DcomLaunch / DCOM Server Process Launcher

DCOM Communication

What is the DcomLaunch (DCOM Server Process Launcher) service?

The DcomLaunch service implements Microsoft’s Component Object Model (COM) and Distributed Component Object Model (DCOM) technologies, which facilitate communication between applications and communication between computers, respectively.

The service’s display name is DCOM Server Process Launcher and it runs inside the service host process, svchost.exe:

DcomLaunch Windows Service

What happens if I stop the DcomLaunch service?

Many Windows applications rely on COM and DCOM. If the service is stopped, those applications will no longer work.

And, as you can see from the service’s Dependencies tab on Windows Server 2019, several important services depend on DCOM Server Process Launcher too:

DcomLaunch service dependencies

So if DcomLaunch is stopped, these services will not be able to start:

  • Background Tasks Infrastructure Service / BrokerInfrastructure: Responsible for background tasks.

  • Local Session Manager / LSM: Manages local user sessions

  • Remote Procedure Call (RPC) / RpcSs: Controls COM and DCOM servers. We’ll dig into this critical component in a future article.

And if those 3 services are stopped, any service that relies on them will also fail to start.

If we walk the “dependency tree” of services, we can see that stopping DcomLaunch would lead to stopping over 60 other services — essentially crippling your computer! Because of this ripple effect, we strongly recommend that you leave DcomLaunch running.

Indeed, Microsoft agrees. Here is their recommendation for the DcomLaunch service on Windows Server 2016 (Desktop):

It is strongly recommended that you have the DCOMLAUNCH service running.

And this recommendation is backed up by the system. By default, you cannot stop the service or modify its startup type from the services control panel. Look closely at the screenshot of the service above to see that all those operations are disabled.

And if the service crashes or is terminated, you may be forced to log off:

DCOM Server Process Launcher service terminated

So please keep it running!

Questions? Problems?

If you would like to know more about the DCOM Server Process Launcher service, or you have a specific problem, please feel free to get in touch. We will do our best to help you!

Posted in Windows Services | Tagged , , , , | 5 Comments

5 Responses to Essential Windows Services: DcomLaunch / DCOM Server Process Launcher

  1. Bill says:

    Found “klvssbridge64_19.0.0” in srevices (win7 os). Lists DCOM Srever Process Launcher and RPC Endpoint Mapper as depends. Cannot find any reference to it. Ever run across it?

  2. Core Technologies Consulting says:

    Hi Bill. That service seems to be related to Kaspersky Anti-Virus. Do you have that package installed on your system?

  3. Stephen Pill says:

    It’s an interesting article – thanks. But it doesn’t go far enough to help explain why my PC – a modest, i5-powered Latitude – has been crippled by the DCOMLaunch group of services, through their intensive processor use (20-60%, mostly 40%). Previously when idle and settled down after boot, 1% was needed to keep the PC ticking over.

    The only change prior to this dramatic change has been the installation of VMware player12 and the copying in of a VM from another machine (and no svchost problems on the previous host machine).

    Can you see anything in this which might explain the calls for COM/DCOM services even when VMware is not running?

  4. Hi Stephen, sorry to hear of the trouble!

    As you have noticed, DcomLaunch service operates in a “shared” environment, with several services running in the same svchost.exe process. Indeed, the following services cohabitate on my Windows 8 desktop:

    • BrokerInfrastructure
    • DcomLaunch
    • LSM
    • PlugPlay
    • Power

    So when DcomLaunch’s svchost process goes wild, it could be due to any of those services. And because all those services are provided by Microsoft, any fixes must come from them.

    Have you tried applying all Windows updates on your laptop, including the optional ones? Microsoft releases patches on the second or fourth Tuesday each month (“Patch Tuesday”). A resolution may be lurking there.

  5. Ronnie says:

    So are saying Microsoft did this to me. I have asked arournd. I thought I had a virus or I had been hacked. Because some jackass I did something wrong. Now my computer is a mess my Microsoft e-mail is down and the setting in my phone keep getting turned off or turned down!

Leave a Reply

Your email address will not be published. Required fields are marked *