I have just recently upgraded an entire vcenter system from 4.1 to 5.1. As well as 10 hosts in 1 site and 1 in the other site.
All seemed to go rather well except for the 1 host in the remote site.
I cannot connect to the management port of the host, however when it was first upgraded I could. Not until I upgraded the vsphere tools on the VMs on the host did I lose the connection.
The VMs running on the host are still all connected and working.
In vcenter the host shows as offline and I cannot ping the IP address of the host.
I have tried restarting the management connection and also the whole server.
I did notice last night when I turned off the VMs that after about an hour I could connect to the management port, but then lost the connection again after about an hour.
I can login to the server via ilo so have been able to troubleshoot from there
I tested the management port from the host and I can ping the default gateway but no further. From other servers I can ping the same default gateway but not the host management port.
The host is in a vlan which is properly configured from what I can tell. Especially as it was working before the upgrade.
I have had the networking team investigate and they have confirmed the switches and vlans are correct but they cannot connect to the actual host, although the port on the switch shows it is active.
I have tried disabling the vmtools on the VMs on the host but this has had no effect.
The management port has 2 network connections with 1 running in standby, I have also tried setting the standby as active but to no avail.
The host itself is showing it has properly updated to the correct version of 5.5
The server is an HP DL380 G7 about 2 years old
I can connect to the host via ilo and have even tried changing the IP address which had no effect, as I thought maybe there was an IP clash
The differences between this host and the other hosts is it is HP and the others are Dell, also for the upgrade I upgraded the Dell servers via upgrade Manager, and the HP was initiated by upgrade manager but as there was an upgrade disk in the server I accidentally upgraded it from that, but this still seemed to upgrade fine.
Any help is much appreciated