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    Hyper-V Manager Sometimes Disconnects from Failed RPC Calls

    IT Discussion
    hyper-v windows server virtualization
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    • scottalanmiller
      scottalanmiller last edited by

      I'll as,k @gjacobse to fill in what he knows from the history on this, but we have a central Hyper-V Manager on Windows Server 2012 R2 that sometimes disconnects and cannot manage Hyper-V hosts because of failed RPC calls.

      0_1523819438122_Screenshot from 2018-04-15 13-55-42.png

      This seems like something that should not happen with any regularity. Now to track down what is causing it. We've not noticed any network reliability issues between machines, but that's not impossible. All in the same rack. I'm told it happens from time to time with two different hosts. At the moment it is affecting only one and not the other.

      gjacobse 1 Reply Last reply Reply Quote 0
      • scottalanmiller
        scottalanmiller last edited by

        Looks like troubleshooting on this was started some time ago:

        https://mangolassi.it/topic/8369/hyper-v-unable-to-reach-vmhost-rpc-call-failed

        gjacobse 1 Reply Last reply Reply Quote 0
        • gjacobse
          gjacobse @scottalanmiller last edited by

          @scottalanmiller said in Hyper-V Manager Sometimes Disconnects from Failed RPC Calls:

          I'll as,k @gjacobse to fill in what he knows from the history on this, but we have a central Hyper-V Manager on Windows Server 2012 R2 that sometimes disconnects and cannot manage Hyper-V hosts because of failed RPC calls.

          0_1523819438122_Screenshot from 2018-04-15 13-55-42.png

          This seems like something that should not happen with any regularity. Now to track down what is causing it. We've not noticed any network reliability issues between machines, but that's not impossible. All in the same rack. I'm told it happens from time to time with two different hosts. At the moment it is affecting only one and not the other.

          Looks like there is about a 5 hour uptime... likely the Manager was running when it rebooted resulting the loss. Restarting the manager re-connected normally

          scottalanmiller 1 Reply Last reply Reply Quote 1
          • gjacobse
            gjacobse @scottalanmiller last edited by

            @scottalanmiller said in Hyper-V Manager Sometimes Disconnects from Failed RPC Calls:

            Looks like troubleshooting on this was started some time ago:

            https://mangolassi.it/topic/8369/hyper-v-unable-to-reach-vmhost-rpc-call-failed

            wow - knowing more now,.. I wonder if it has to do with the reboot cycle.

            1 Reply Last reply Reply Quote 0
            • scottalanmiller
              scottalanmiller @gjacobse last edited by

              @gjacobse said in Hyper-V Manager Sometimes Disconnects from Failed RPC Calls:

              Looks like there is about a 5 hour uptime... likely the Manager was running when it rebooted resulting the loss. Restarting the manager re-connected normally

              Surprising that after so many hours it would not reconnect given that it was a fresh view attempt of that host.

              JaredBusch 1 Reply Last reply Reply Quote 0
              • JaredBusch
                JaredBusch @scottalanmiller last edited by

                @scottalanmiller said in Hyper-V Manager Sometimes Disconnects from Failed RPC Calls:

                @gjacobse said in Hyper-V Manager Sometimes Disconnects from Failed RPC Calls:

                Looks like there is about a 5 hour uptime... likely the Manager was running when it rebooted resulting the loss. Restarting the manager re-connected normally

                Surprising that after so many hours it would not reconnect given that it was a fresh view attempt of that host.

                Not particularly, if you have used this tool much.

                The feeling I get from using it, is that the connection is never forgotten until you close and reopen.

                1 Reply Last reply Reply Quote 0
                • dbeato
                  dbeato last edited by

                  Are this Windows AD domain joined Hyperv servers? I see that issue when the DCs are offline or rebooting.

                  bbigford 1 Reply Last reply Reply Quote 0
                  • bbigford
                    bbigford @dbeato last edited by

                    @dbeato said in Hyper-V Manager Sometimes Disconnects from Failed RPC Calls:

                    Are this Windows AD domain joined Hyperv servers? I see that issue when the DCs are offline or rebooting.

                    I've experienced similar when hosts are not on a domain and the VMs are. All kinds of WMI errors requiring PowerShell to resolve; management and connectivity between joined and non-joined.

                    1 Reply Last reply Reply Quote 0
                    • PhlipElder
                      PhlipElder last edited by PhlipElder

                      Do the hosts have their firewall enabled with logging enabled (should be)? If yes, check the log for dropped packets.

                      Are DNS 0/1 on the pNIC of the host set up correctly? Is there a missing DNS server there?

                      Is DNS sync'd correctly between DNS servers?

                      Anything in the source or destination Event Logs?

                      1 Reply Last reply Reply Quote 0
                      • Obsolesce
                        Obsolesce last edited by

                        You can restart the Hyper-V Virtual Machine Management service or the Windows Remote Management service and it should work.

                        1 Reply Last reply Reply Quote 1
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