deajan opened a new issue, #10727: URL: https://github.com/apache/cloudstack/issues/10727
### problem So I added a KVM hypervisor running AlmaLinux 9.5 to a Cloudstack Management Server via the UI, which failed with error `Unable to add the host: Cannot find the server resources at <host>`  While digging in the cloudstack management-server.log file, I noticed that my bridge `br_npf0` is not found according to the management server: ``` 2025-04-15 14:47:43,865 INFO [c.c.a.m.ClusteredAgentManagerImpl] (AgentManager-Handler-7:[]) (logid:) PingMap for agent: 1 will not be updated because agent is no longer in the PingMap 2025-04-15 14:47:43,866 DEBUG [c.c.a.m.ClusteredAgentManagerImpl] (AgentManager-Handler-7:[]) (logid:) Not processing PingRoutingCommand for agent id=0; can't find the host in the DB 2025-04-15 14:47:43,867 DEBUG [c.c.a.t.Request] (AgentManager-Handler-8:[]) (logid:) Seq 1-9217179587367141377: Processing: { Ans: , MgmtId: 90520739542428, via: 1, Ver: v1, Flags: 110, [{"com.cloud.agent.api.CheckNetworkAnswer":{"_reconnect":"false","result":"false","details":"Can not find network: br_npf0","wait":"0","bypassHostMaintenance":"false"}}] } 2025-04-15 14:47:43,867 DEBUG [c.c.a.m.ClusteredAgentAttache] (AgentManager-Handler-8:[]) (logid:) Seq 1-9217179587367141377: No more commands found 2025-04-15 14:47:43,867 DEBUG [c.c.a.t.Request] (AgentConnectTaskPool-596:[ctx-58c65884]) (logid:c8f5bf3e) Seq 1-9217179587367141377: Received: { Ans: , MgmtId: 90520739542428, via: 1(reacted_host_name.local), Ver: v1, Flags: 110, { CheckNetworkAnswer } } 2025-04-15 14:47:43,867 DEBUG [c.c.a.m.ClusteredAgentManagerImpl] (AgentConnectTaskPool-596:[ctx-58c65884]) (logid:c8f5bf3e) Details from executing class com.cloud.agent.api.CheckNetworkCommand: Can not find network: br_npf0 2025-04-15 14:47:43,867 WARN [o.a.c.e.o.NetworkOrchestrator] (AgentConnectTaskPool-596:[ctx-58c65884]) (logid:c8f5bf3e) Unable to setup agent 1 due to Can not find network: br_npf0 2025-04-15 14:47:43,870 WARN [c.c.a.AlertManagerImpl] (AgentConnectTaskPool-596:[ctx-58c65884]) (logid:c8f5bf3e) alertType=[7] dataCenterId=[1] podId=[1] clusterId=[null] message=[Incorrect Network setup on agent, Reinitialize agent after network names are setup, details : Can not find network: br_npf0]. 2025-04-15 14:47:43,878 WARN [c.c.a.AlertManagerImpl] (AgentConnectTaskPool-596:[ctx-58c65884]) (logid:c8f5bf3e) No recipients set in global setting 'alert.email.addresses', skipping sending alert with subject [Incorrect Network setup on agent, Reinitialize agent after network names are setup, details : Can not find network: br_npf0] and content [Incorrect Network setup on agent, Reinitialize agent after network names are setup, details : Can not find network: br_npf0]. 2025-04-15 14:47:43,878 INFO [c.c.u.e.CSExceptionErrorCode] (AgentConnectTaskPool-596:[ctx-58c65884]) (logid:c8f5bf3e) Could not find exception: com.cloud.exception.ConnectionException in error code list for exceptions [...] 2025-04-15 14:47:43,890 DEBUG [c.c.a.m.ClusteredAgentManagerImpl] (AgentConnectTaskPool-596:[ctx-58c65884]) (logid:c8f5bf3e) Failed to handle host connection: com.cloud.exception.ConnectionException: Incorrect Network setup on agent, Reinitialize agent after network names are setup, details : Can not find network: br_npf0 at org.apache.cloudstack.engine.orchestration.NetworkOrchestrator.processConnect(NetworkOrchestrator.java:4321) at com.cloud.agent.manager.AgentManagerImpl.notifyMonitorsOfConnection(AgentManagerImpl.java:553) at com.cloud.agent.manager.AgentManagerImpl.sendReadyAndGetAttache(AgentManagerImpl.java:1116) at com.cloud.agent.manager.AgentManagerImpl.handleConnectedAgent(AgentManagerImpl.java:1135) at com.cloud.agent.manager.AgentManagerImpl$HandleAgentConnectTask.runInContext(AgentManagerImpl.java:1227) at org.apache.cloudstack.managed.context.ManagedContextRunnable$1.run(ManagedContextRunnable.java:49) at org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56) at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103) at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53) at org.apache.cloudstack.managed.context.ManagedContextRunnable.run(ManagedContextRunnable.java:46) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) at java.base/java.lang.Thread.run(Thread.java:840) ``` Looking at my configuration on the KVM host, the bridge `br_npf0` exists, is up, has an IP, and can ping the management server. ``` ip a | grep br_npf0 10: br_npf0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 inet 10.13.37.2/24 brd 10.13.37.255 scope global noprefixroute br_npf0 28: eno2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br_npf0 state UP group default qlen 1000 # pinging the cloudstack management server ping cloudstack01i.npf.local -c 1 PING cloudstack01i.npf.local (10.13.37.250) 56(84) bytes of data. 64 bytes from cloudstack01i.npf.local (10.13.37.250): icmp_seq=1 ttl=64 time=0.687 ms --- cloudstack01i.npf.local ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.687/0.687/0.687/0.000 ms ``` The management server zone is setup with that exact same bridge name:  Is there any direction to point me to ? ### versions Cloudstack 4.20 running on AlmaLinux 9.5 KVM host AlmaLinux 9.5 with bridge setup via NetworkManager ### The steps to reproduce the bug ### What to do about it? _No response_ -- This is an automated message from the Apache Git Service. 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