How To Find Out What Ports Are Already In Use

IT Support Forum Forums Active Directory Installation How To Find Out What Ports Are Already In Use

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This topic contains 1 reply, has 1 voice, and was last updated by  Webmaster 1 week, 4 days ago.

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  • #2285

    Webmaster
    Keymaster

    When installing (promoting) your Domain Controller, you can get this error:

    Verification of prerequisites for Domain Controller promotion failed. The TCP ports required by Active Directory Domain Services are already in use on this computer. You must remove or reconfigure the services that are currently using these ports (88, 389, 636, 3268, 3269).

    To find out what ports are already being used that cause the TCP ports required by Active Directory Domain Services are already in use on this computer error, run this command in the command prompt:

    netstat

  • #2286

    Webmaster
    Keymaster

    ❗ Note: vCenter uses port 88, which seems to be a common issue causing the TCP ports required by Active Directory Domain Services are already in use on this computer error. Otherwise, as stated above, you can find out what port is used using the netstat command.

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