I recently had an issue with installing vSphere Update Manager where i was getting an error and it wouldn’t install.  Looking closer at the log files i had the following message:

System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it xxx.xxx.xxx.xxx:9084

 

The following on the vSphere Knowledge Base site helped me resolve it:


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http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004887

 

Specifically downloading the client directly from the vCenter Server and installing it manually:

 

http://xxx.xxx.xxx.xxx:9084/vci/downloads/VMware-UMClient.exe  (take note of capital letters in the file name)