Ran into the same problems with the 2.5 upgrade this morning. About half of mine wouldn't reconnect...
In the end. I realized my times were off slightly. Got NTP up and running and everything started reconnecting correctly.
I tried most of the suggestions in this thread. Still no luck. When I ran the script, I noticed, it created the folder vpx-upgrade-installer.
In that folder, found the rpm VMware-vpxa-2.5.0-64192.i386.rpm
tried to install that rpm & bingo got the reason for failure. There is no space left on /var/log.
I got same problems while back doing 30 esx hosts upgrade for a client and 2 of them didn't work so I've checked the vpxa package version which doesn't match with other esx hosts. I've removed it and copied the new vpx package from VC server and reinstalled it and restart mgmt-vmware services and repeat same process.
"The Power of Knowledge"
Thank you for the "service mgmt-vmware restart" tip. I was upgrading from 2.0 to 2.5 update1 and 1 ESX host would NOT re-connect. That fixed it!!
Vielen Dank für Ihre Nachricht!
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I had the same issue of trying to add the Host back into Virtual Center.
What I found is we had some residual NFS mounts back to a Windows machine.
We had removed this and started using iSCSI some time ago.
However, it did not look like everything was removed from this Host.
the /etc/mtab still had the mount points entered. /etc/fstab was clear.
After removing the entries from the mtab and umounting the mount points I was able to successfully connect the host into Virtual Center.