topic ESXi/ESX host disconnects from vCenter Server after power up VM: "An error occured while communicating with remote host" in ESXi Discussions

ESXi/ESX host disconnects from vCenter Server after power up VM: "An error occured while communicating with remote host"

Bognad — Tue, 09 Oct 2018 10:07:05 GMT

I encontered an strange error, when i try to power on a VM (or change VM configuration) through a vCenter the error message appears :An error occured while communicating with remote host

ESXi host disconnect immediately (5-10 sec) after clicking PowerOn button. All VMs are work fine, only ESXi host disconnect from vCenter.

I try change config.vpxd.heartbeat.notrespondingtimeout=120.

VMware Knowledge Base

But the problem still remains.

I had the same happen in vSphere 5.5 and 6.5.

I have meet this error every power up VM.

The vpxd.log is empty.

Re: ESXi/ESX host disconnects from vCenter Server after power up VM: "An error occured while communicating with remote host"

msripada — Tue, 09 Oct 2018 13:49:20 GMT

If it is happening to disconnect the ESXi hosts for 5.5 and 6.5, then I would strongly advise to check the port 902 UDP if it is open between ESXi and vCenter. port 902 UDP is used for heartbeat. If the heartbeat is missed or not received within the time (Default of 60 seconds, which you changed to 120 with the advanced parameter), the ESXi will be marked not responding.

VMware Knowledge Base

- MS

Re: ESXi/ESX host disconnects from vCenter Server after power up VM: "An error occured while communicating with remote host"

Bognad — Mon, 15 Oct 2018 18:35:20 GMT

Tankyou msripada !

ESXi host disconnect immediately (msx 5-10 sec, not 60, not 120 sec) after clicking PowerOn button.

I have several ESXi server, but problem only at one - 172.16.37.179.

172.16.37.179 ESXi 6.5 disconnect when VM Power UP.

172.16.37.100 ESXi 5.5 work fine

172.16.37.127 ESXi 5.5 work fine

172.16.37.177 ESXi 5.5 work fine

172.16.37.179 ESXi 6.5 work fine

172.16.37.210 ESXi 6.5 work fine

172.16.37.209 vCenter 6.5

Result nmap -sU -sV -p 904 -PU 172.16.37.XXX :

172.16.37.179 ESXi 6.5 disconnect

PORT STATE SERVICE

904/udp open|filtered unknown

172.16.37.100 ESXi 5.5 work fine

PORT STATE SERVICE

904/udp closed unknown

172.16.37.127 ESXi 5.5 work fine

PORT STATE SERVICE

904/udp open|filtered unknown

172.16.37.177 ESXi 5.5 work fine

PORT STATE SERVICE

904/udp closed unknown

172.16.37.210 ESXi 6.5 work fine

PORT STATE SERVICE

904/udp open|filtered unknown

172.16.37.209 vCenter 6.5

PORT STATE SERVICE

904/udp open|filtered unknown

Re: ESXi/ESX host disconnects from vCenter Server after power up VM: "An error occured while communicating with remote host"

rajen450m — Tue, 16 Oct 2018 10:51:17 GMT

Hi,

Please follow the below steps and check.

=> Power ON ESXi and navigate to advanced settings and change the below tow:

“numa.autosize.once = False”
“Numa.FollowCoresPerSocket = 1”

Regards,

Re: ESXi/ESX host disconnects from vCenter Server after power up VM: "An error occured while communicating with remote host"

Bognad — Thu, 18 Oct 2018 13:02:47 GMT

Thankyou!

vnuma and reconnect

sorry how is that related?

Re: ESXi/ESX host disconnects from vCenter Server after power up VM: "An error occured while communicating with remote host"

Bognad — Fri, 19 Oct 2018 11:10:44 GMT

ESXi configuration file config.xml had some syntax error.