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The RPC server is unavailable

Written by Xaus Xavier Nadal on February 8th, 2012

Good Morning.

Some time ago the famous season Conficker virus found a RPC error on some servers.

The problem is that could not be accessed by depending on resources, then by ip, but not by name, and also share and could still be some of you continue with this problem but do not know, because at a glance system is working well, but really the DHCP Client service is started with a user who should not and causing these errors.

To detect the problem quickly could ping the server and do not find in the dns since not answer the RPC server dns removed (If you have so configured) the records to 7 days.

By accessing the server and do a ipconfig / registerdns to re-register the ip in the dns we would see the following error.


As We solve this?

There 2 options.

The first is to modify the permissions of 2 registry keys that will be presented here:

HKLM \ SYSTEM \ CurrentControlSet \ Services \ DHCP (You must click with right mouse button on the key and click on Permissions -> Add the local user and give NETWORK SERVICE read / Read.

HKLM \ SYSTEM \ CurrentControlSet \ Services \ DHCP \ Parameters \ (You must click with right mouse button on the key and click on Permissions -> Add the local user NETWORK SERVICE and give FULL CONTROL permissions

Now just have to start the DHCP Client service again the problem being solved.

If this does not work then you can use the following option:

For accessing system services: Home -> Run -> services.msc and configuring the service DHCP Client o DHCP Client with the user LocalSystem o Local System instead of Network service account.

Now only DHCP Client service startup and do ipconfig / registerdns again to leave it all right.


If this is happening to you I recommend you analicéis equipment and possibly even a conficker resident you may have some equipment.

If I have time I pass a script to remotely check that all servers have the DHCP service with the LocalSystem user.

Until next time.

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2 Responses to "The RPC server is unavailable"

  1. malena Says:

    xavier, thank you! you saved me!

  2. Anonymous Says:

    I get no HKLM /

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