5 Replies Latest reply on Feb 22, 2019 8:28 PM by nflsubs

    HA agent on host could not reach isolation addrss

    dirkidgs Novice

      three host esxi HA environment with shared storage.

       

      one hosts keeps throwing the following error.

       

      "vSphere HA agent on this host could not reach isolation address 192.168.0.x"

       

      can you help?

        • 1. Re: HA agent on host could not reach isolation addrss
          DavoudTeimouri Master
          vExpert

          Check you VMKernel portgroup configuration (Management traffic) and also ESXi firewall configuration.

          The address is not reachable via network between the hosts.

          Try to ping other hosts from one host and repeat it on all hosts.

          • 2. Re: HA agent on host could not reach isolation addrss
            a.p. Guru
            User ModeratorsvExpertCommunity Warriors

            By default, the Management Network's default gateway address is used as the isolation address. Please check whether this is configured properly and has not accidentally been modified with e.g. configuring vMotion.

             

            André

            • 3. Re: HA agent on host could not reach isolation addrss
              tomtom901 Expert
              vExpert

              Seeing as the other hosts (assuming they are in the same subnet) can ping the isolation address (which is the default gateway for the management VMkernel as Andre points out), we can assume that the default gateway is an ICMP pingable device. Your best bet would be to check the specific host and see if you can ping the default gateway here. You can see what the default gateway is by running the command: esxcli network ip route ipv4 list, which would give you an output like this:

               

              ~ # esxcli network ip route ipv4 list

              Network      Netmask        Gateway      Interface  Source

              -----------  -------------  -----------  ---------  ------

              default         0.0.0.0          192.168.1.1  vmk0       MANUAL

              192.168.1.0  255.255.255.0  0.0.0.0      vmk0       MANUAL

              192.168.2.0  255.255.255.0  0.0.0.0      vmk3       MANUAL

              192.168.3.0  255.255.255.0  0.0.0.0      vmk1       MANUAL

              ~ #

               

              The first line is your default gateway. That should be reachable for the hosts in a HA enabled cluster, as they ping this address to check if they have been isolated from the network.

              • 4. Re: HA agent on host could not reach isolation addrss
                SavkoorSuhas Expert
                vExpert

                Select the host giving this issue.
                Go to Configuration > Networking

                Locate the Management VMkernel Port group and click Properties

                Select the Management Port Group and Edit > IP settings

                Note the default gateway.

                 

                Right click the cluster > Edit settings

                VMware HA > Advanced Options

                Enter the following

                das.isolationaddress under option

                Enter default gateway IP under value

                 

                Click OK.

                 

                Right click the host > Reconfigure for HA. @

                 

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                • 5. Re: HA agent on host could not reach isolation addrss
                  nflsubs Lurker

                  Check your default gateway for the host.

                  Correct the gateway if you changed recently.