I found that some client pc were not monitored after reinstall the SCE server.Even I tried to uninstall or repair the agent, it returned the following messages:The MOM Server failed to open service control manager on computer HK-ca.com. Therefore, the MOM Server cannot complete configuration of agent on the computer. Operation: Agent Uninstall Install account: DOMAIN\administrator Error Code: 800706BA Error Description: The RPC server is unavailable.I tried to uselocal administrator but still failed.Thank you for any help.Wilson

Hello Wilson,1. Telnet problematic client port 135 from SCE serverto see if it works fine. such as telnet <FQDNclientname> 135.2. Check if clients have been registered in DNS server correctly. You can use nslookup command to test.3. Ensure the GPOs created by SCE have been applied on the agents. And the RPC and 'Remote Registry' services are running fine. Thanks,Yog Li - MSFT

1. I think it works on port 135 but no welcome message while connected.2. Would you tell me more details in how to check with nslookup? Thanks.3. How can I check the RPC and Remote registry services are running fine?I found the RPC service are running, but remote registry service is stop. Do I set it to auto run?I tried to install the agent manually. It works but SCE cannot update the version. the task always stuck on pending management queue without type name.

Hello Clown,1. Make sure the Telnet service is running, so you can have the welcome message. 2. Please read the following KB article: Using NSlookup.exehttp://support.microsoft.com/kb/200525/en-us 3. You can check the services by running the command "services.msc". Make sure they are Automatic and Started.Thanks,Yog Li - MSFT

Hello Yog,I have to compare the normal clientwith problematic client computers, their settings are the same.I must uninstall the new version agent from client and install the original agent manuallyto fix the problem, but still cannot update the agent version from SCE server. Please help.

Hi Clown,Did you mean "SCE 2007 RTM version" and "SCE 2007 SP1 version" with the words: "original agent" and "new version agent"? Please be notified that SCE 2007 Server and agents must have the same version to communicate with each other.The following article may be helpful for your scenario:How to Configure a Manually Installed System Center Essentials Agenthttp://technet.microsoft.com/en-us/library/bb437257.aspxThanks,Yog Li - MSFT

Right. I use the setup cd to install the agent. And I tried to repair the new version agent on client pc to fix the problem but not work.As your link. What's the effect on step 7?I tried to repair/reinstall the agent by SCE.The task always stuck on pending management queue without type name.