ESXi Host Not Responding

[Blueboy1878]

Hi

We seems to have an issue with our VCentre and/ or our ESXi hosts. We are running ESXi 6.5 U1 on the hosts and we have come in this morning and all of our hosts are saying (not responding). We have tried to reconnect them and it come up with an incorrect username and password error but I am able to connect to the esxi shell using the same credentials so i dont think this is the actual error. We have also disconnected one of the hosts and tried to re-add it and we get the same error. I dont really want to remove the host from the Inventory and as all of our hosts are running critical systems I am unable to put it in maintenance mode and reboot. Any ideas?

Thanks

[Blueboy1878]

We also get an error relating to a vpxa timeout but I have checked the service and it is started on the host

[hussainbte]

verify TCP and UDP communication between the hosts and vcenter on 902

VMware Knowledge Base

[daphnissov]

Are you maybe using a trial license, or a key which has an expiration date set? If not, you'll need to look at hostd and vpxa logs to figure out why they disconnected.

[admin]

I  would recommend that if i you follow the following KB: Troubleshooting an ESXi/ESX host in non responding state (1003409) | VMware KB to eliminate possible causes whilst the issue is occurring.

If you found my answers useful please consider marking them as Correct OR Helpful

[vAndrew]

Is there a firewall between them thats blocking ports? We had similar a while ago and the firewall was blocking the communications, port 902/903 i think it was.

Ive also seen this when the licences expire, and also if the hardware is not fully supported. We discovered this recently and ended up rolling it back to a previous version and been fine since.

[sarikrizvi]

1. Disable firewall and check host connect back in vcenter.

# esxcli network firewall get

# esxcli network firewall set --enable false

2. If host connected back in vcenter after disabling firewall , then re-enable firewall again and monitor host.

# esxcli network firewall set --enabled true

3. if host disconnected in vcenter again , enable "VMware vCenter Agent"

Go to Host through vClient >> Select Configuration >> Go to "Security Profile" >>> click on "Edit" >> Click Check-mark on box  "VMware vCenter Agent" for Port 902.

Check now host will connect back in vcenter