GitHub user KuasarCloud closed a discussion: Recurring error in the VR Router
in ACS 4.20.1
Hey community!
After upgrading to 4.20.1 I'm getting this error when trying to start a VM. A
VPC clean up is needed everytime, any clue?
```
2025-07-17 15:44:15,094 WARN [c.c.v.ClusteredVirtualMachineManagerImpl]
(Work-Job-Executor-45:[ctx-867b7b76, job-50106/job-50110, ctx-3c4763dd])
(logid:0d91769e) Unable to contact resource.
com.cloud.exception.ResourceUnavailableException: Resource [DataCenter:2] is
unreachable: Unable to apply dhcp entry on router
at
org.apache.cloudstack.network.topology.BasicNetworkTopology.applyRules(BasicNetworkTopology.java:404)
at
org.apache.cloudstack.network.topology.AdvancedNetworkTopology.applyDhcpEntry(AdvancedNetworkTopology.java:173)
at
com.cloud.network.element.VirtualRouterElement.applyDhcpEntries(VirtualRouterElement.java:1087)
at
com.cloud.network.element.VirtualRouterElement.addDhcpEntry(VirtualRouterElement.java:1055)
at
org.apache.cloudstack.engine.orchestration.NetworkOrchestrator.prepareElement(NetworkOrchestrator.java:1831)
at
org.apache.cloudstack.engine.orchestration.NetworkOrchestrator.prepareNic(NetworkOrchestrator.java:2206)
at
org.apache.cloudstack.engine.orchestration.NetworkOrchestrator.prepare(NetworkOrchestrator.java:2135)
at
com.cloud.vm.VirtualMachineManagerImpl.orchestrateStart(VirtualMachineManagerImpl.java:1286)
at
com.cloud.vm.VirtualMachineManagerImpl.orchestrateStart(VirtualMachineManagerImpl.java:5486)
at jdk.internal.reflect.GeneratedMethodAccessor386.invoke(Unknown
Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:569)
at
com.cloud.vm.VmWorkJobHandlerProxy.handleVmWorkJob(VmWorkJobHandlerProxy.java:102)
at
com.cloud.vm.VirtualMachineManagerImpl.handleVmWorkJob(VirtualMachineManagerImpl.java:5610)
at com.cloud.vm.VmWorkJobDispatcher.runJob(VmWorkJobDispatcher.java:99)
at
org.apache.cloudstack.framework.jobs.impl.AsyncJobManagerImpl$5.runInContext(AsyncJobManagerImpl.java:652)
at
org.apache.cloudstack.managed.context.ManagedContextRunnable$1.run(ManagedContextRunnable.java:49)
at
org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56)
at
org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103)
at
org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53)
at
org.apache.cloudstack.managed.context.ManagedContextRunnable.run(ManagedContextRunnable.java:46)
at
org.apache.cloudstack.framework.jobs.impl.AsyncJobManagerImpl$5.run(AsyncJobManagerImpl.java:600)
at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:840)
```
GitHub link: https://github.com/apache/cloudstack/discussions/11240
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