rhtyd commented on issue #2540: problem adding new shared network NIC to VM "A NIC with this MAC address exits for network:" URL: https://github.com/apache/cloudstack/issues/2540#issuecomment-387714577 I was able to reproduce this using mentioned steps: ``` 2018-05-09 11:54:34,243 DEBUG [o.a.c.f.j.i.AsyncJobManagerImpl] (API-Job-Executor-4:ctx-93641744 job-151) (logid:01cf6a76) Executing AsyncJobVO {id:151, userId: 2, accountId: 2, instanceType: None, instanceId: null, cmd: org.apache.cloudstack.api.command.admin.vm.AddNicToVMCmdByAdmin, cmdInfo: {"virtualmachineid":"5be800c6-c06a-4944-97be-0b2339cf9fff","response":"json","ctxUserId":"2","httpmethod":"GET","networkid":"cafc6944-64fe-488a-bf2c-916ed89090b3","ctxStartEventId":"349","ctxDetails":"{\"interface com.cloud.vm.VirtualMachine\":\"5be800c6-c06a-4944-97be-0b2339cf9fff\",\"interface com.cloud.network.Network\":\"cafc6944-64fe-488a-bf2c-916ed89090b3\"}","ctxAccountId":"2","cmdEventType":"NIC.CREATE","_":"1525866874211"}, cmdVersion: 0, status: IN_PROGRESS, processStatus: 0, resultCode: 0, result: null, initMsid: 5071960016, completeMsid: null, lastUpdated: null, lastPolled: null, created: null} 2018-05-09 11:54:34,244 DEBUG [c.c.a.ApiServlet] (qtp1096283470-12:ctx-89cce544 ctx-21b232ff) (logid:05f9e858) ===END=== 192.168.1.108 -- GET command=addNicToVirtualMachine&response=json&virtualmachineid=5be800c6-c06a-4944-97be-0b2339cf9fff&networkid=cafc6944-64fe-488a-bf2c-916ed89090b3&_=1525866874211 2018-05-09 11:54:34,300 ERROR [c.c.a.ApiAsyncJobDispatcher] (API-Job-Executor-4:ctx-93641744 job-151) (logid:01cf6a76) Unexpected exception while executing org.apache.cloudstack.api.command.admin.vm.AddNicToVMCmdByAdmin com.cloud.utils.exception.CloudRuntimeException: A NIC with this MAC address exists for network: cafc6944-64fe-488a-bf2c-916ed89090b3 at com.cloud.vm.UserVmManagerImpl.addNicToVirtualMachine(UserVmManagerImpl.java:1204) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) ```
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