Remote ESXi hosts show as 'not responding'

[crosen]

I'm running VC 2.5 with local ESX 3.5 U4 hosts. I've recently added three ESXi 3.5 hosts into a new cluster. They add fine, but then turn to 'not responding' after a few minutes. I can disconnect and reconnect, but same thing. I am told the WAN uplinks are sufficient. Not sure if this is a setting or something else easy. Thanks.

[Troy_Clavell]

have you tried restarting the management agents?

http://www.vm-help.com/esx40i/ESXi_restart_agents.php

[crosen]

I tried '/sbin/services.sh restart', disconnected the host, reconnected, but then a few minutes later the host is showing 'not responding' again.

[Troy_Clavell]

It could be a name resolution issue as well. Ensure you can resolve both shortname and long name of your ESXi hosts from your vCenter Host.

Also, if nothing else it just may be a timeout issue in vCenter. You may look at increasing the timeout

http://www.yellow-bricks.com/2009/02/11/increasing-the-time-out-within-vcenter-for-remote-esx-hosts/

[crosen]

I verified DNS resolution on both sides.

I updated the timeout to 120 seconds, but still get the same problem.

Do you know the UDP port that is being used? I'll verify the firewall. Thanks.

[Troy_Clavell · Accepted solution]

check 902

[crosen]

This was in fact a firewall issue. Thanks.