Install ESX 4 host certificate from windows CA

I used this article and was able to get the certificate generated and installed
http://vm-help.com/esx/esx3i/change_name_and_cert.php

But after reboot I can SSH to my ESX host, but the certificate is not working the webpage is dead and I can’t add the ESX host back to vCenter

I found the problem, at the end of the article it has you put the key and cert in the wrong place

cp rui.key /host/ssl_key
cp esx.cer /host/ssl_cert

but that doesn't work. 

you need to do this instead:
cp rui.key /etc/vmware/ssl/
cp esx.cer /etc/vmware/ssl/

then

mv esx.cer rui.crt (must be renamed)