DaanHoogland commented on issue #4700:
URL: https://github.com/apache/cloudstack/issues/4700#issuecomment-784025691
this one is a known issue but shouldn't hamper you, I've seen it in working
envs.
```
Feb 22 16:42:48 cloud.upbcist.priv java[40541]: ERROR
[kvm.resource.LibvirtComputingResource] (main:) (logid:) uefi properties file
not found due to: Unable to find file uefi.properties.
```
this one is not good, but i'm not sure if it is related
```
Feb 22 16:42:49 cloud.upbcist.priv java[40541]: libvirt: Domain Config error
: invalid connection pointer in virConnectGetVersion
Feb 22 16:42:49 cloud.upbcist.priv java[40541]: ERROR
[kvm.resource.LibvirtConnection] (Agent-Handler-1:) (logid:) Connection with
libvirtd is broken: invalid connection pointer in virConnectGetVersion
```
and later, this looks like the agent tries to identify itself as a known
agent with id 0. I think the initialisation of the agent went wrong
```
Feb 22 16:42:49 cloud.upbcist.priv java[40541]: INFO [cloud.agent.Agent]
(Agent-Handler-2:) (logid:) Startup Response Received: agent id = 0
Feb 22 16:42:49 cloud.upbcist.priv java[40541]: INFO [cloud.agent.Agent]
(AgentShutdownThread:) (logid:) Stopping the agent: Reason = sig.kill
```
here it seems the unknown agent tried to do business as usual.
```
Feb 22 16:42:49 cloud.upbcist.priv java[36735]: WARN
[c.c.a.m.AgentManagerImpl] (AgentManager-Handler-13:null) (logid:) Throwing
away a request because it came through as the first command on a connect: Seq
0--1: { Cmd , MgmtId: -1, vi
Feb 22 16:42:49 cloud.upbcist.priv java[36735]: WARN
[c.c.a.m.AgentManagerImpl] (AgentManager-Handler-14:null) (logid:) Throwing
away a request because it came through as the first command on a connect: Seq
0-1: { Cmd , MgmtId: -1, via
Feb 22 16:42:50 cloud.upbcist.priv libvirtd[36629]: 2021-02-22
21:42:50.926+0000: 36629: error : virNetSocketReadWire:1806 : End of file while
reading data: Input/output error
```
I think your best way forward is to clean the agent machine and re-add it to
cloudstack. Check the host table in the DB as well to make sure there is no
entry crooked for the agent.
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