I had the same problem.
By increasing RAM size of ESXi 4.1 host from 2GB to 2.5GB, all works fine now. As suggested in this post I think it RAM size issue on ESXi4.1
Before this I have tried some suggestions from KB article those includes enabling scratch swap, renaming management network, host name resolution and reconnecting ESXi4.1. Now I am sure renaming management network and enabling scratch swap are not relevant to the problem. Just increasing RAM size fixes it. scratch swap is not enabled and menagement network name unchanged. I configured HA with ESX4.1 and ESXi4.1 so management network name is different. one is 'Service Console' and the other is 'Management Network'.
Thanks for the all suggestions posted here.
It really is a Monday. I'm not following you on where you adding RAM.
Since ESXi doesn't have a service console I didn't think you had to set aside RAM anymore.
I have one ESXi 4.1 fully patch server having an issue were the HA fails to configure. This is after a reboot from this weekend. (Servers all got reracked and CNA cards installed)
I assume that you're testing ESXi in virtual environment. So you can add more memory by editting virtual machine configuration.
I was testing ESXi 4.1 virtial machines in VMware Workstation.
If you're using physical server for ESXi 4.1 then I think you need more RAM installed phydically.
Let me know more about your environment. Is it virtual or physical? How many RAMs configured for ESX4.1?
From ChangHo's iPhone
ESXi 4.1 HA configure error!!!
reply from benwayj<http://communities.vmware.com/people/benwayj> in VMware ESX™ 4 - View the full discussion<http://communities.vmware.com/message/1847136#1847136