Configuration issues: vmodl.fault.HostCommunication

Configuration issues: vmodl.fault.HostCommunication

While adding an ESX host to a vCenter I received the following warning:

Configuration Issues
Virtual machine creation may fail because agent is unable to retrieve VM creation options from the host (vmodl.fault.HostCommunication).

First make sure you can successfully ping the specific ESX host FQDN from your vCenter server.

C:\Users\Administrator.lab>ping esx01.lab.local

Pinging esx01.lab.local [] with 32 bytes of data:
Reply from bytes=32 time<1ms TTL=64
Reply from bytes=32 time<1ms TTL=64

Second log on to your ESX host via SSH and make sure you can ping the vCenter server FQDN.

~ # ping vcenter.lab.local
PING vcenter.lab.local ( 56 data bytes
64 bytes from icmp_seq=0 ttl=128 time=0.374 ms
64 bytes from icmp_seq=1 ttl=128 time=0.252 ms
64 bytes from icmp_seq=2 ttl=128 time=0.248 ms

If any of the above fails the main problem is a DNS issue.

In case both work successful try restarting the Management Agents on the ESX host.

The ESXi Shell can be disabled by an administrative user. See the
vSphere Security documentation for more information.
~ # restart
Running vmware-fdm stop
Stopping vmware-fdm:success
Please use /etc/init.d/sfcbd-watchdog start
Running vmware-fdm restart
Starting vmware-fdm:success

~ # 

Next try reconnecting the specific ESX host. This should restore the connection and resolve the issue.

Niels Engelen
Working as a Global Technologist in Product Strategy for Veeam Software with an interest for anything virtual and cloud. Niels is as a VMware Certified Professional (VCP-DCV 4, 5, 6) and a Veeam Certified Architect (VMCA). Niels also gained the VMware vExpert award (2012-2017) and is an ex-PernixPro.

2 thoughts on “Configuration issues: vmodl.fault.HostCommunication

  1. Hi Neils,

    Thanks for the article. Just wanted to know about the step where in we need to run the command /sbin/ restart.

    If I have HA enable cluster with isolation response set as power off. Running the will put the Host in isolation mode and restart the VMs?

    Have you seen if running the command restarts the VMs?


Comments are closed.

Comments are closed.