No Agent State on the System Virtual Machine

[miloserdoff]

Hello. I'm using Apache Cloudstack 4.20.1.0. My server had been down for a while, and when I decided to turn it on, I encountered the following problem:

What could be the problem? There are no errors in the Cloudstack Management and Cloudstack Agent logs.

[weizhouapache]

@miloserdoff
are you able to ssh into the system vms or "virsh console xxx" on the kvm host ?
if yes, please check /var/log/cloud.log inside the syetem vms

[miloserdoff]

@weizhouapache
Hi. I can connect to SSVM via the virsh console. There is an entry in the logs /var/log/cloud.log:

2026-05-29T05:54:19,115 INFO [cloud.agent.Agent] (main:[]) Connecting to host: 192.168.3.55
2026-05-29T05:54:19,115 INFO [utils.nio.NioClient] (main:[]) Connecting to 192.168.3.55:8250
2026-05-29T05:56:29,282 ERROR [utils.nio.NioClient] (main:[]) IOException while connecting to 192.168.3.55:8250 java.net.ConnectException: Connection timed out 
at java.base/sun.nio.ch.Net.connect0(Native Method) 
at java.base/sun.nio.ch.Net.connect(Net.java:579) 
at java.base/sun.nio.ch.Net.connect(Net.java:586) 
at java.base/sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:853) 
at com.cloud.utils.nio.NioClient.init(NioClient.java:65) 
at com.cloud.utils.nio.NioConnection.start(NioConnection.java:112) 
at com.cloud.agent.Agent.start(Agent.java:335) 
at com.cloud.agent.AgentShell.launchNewAgent(AgentShell.java:459) 
at com.cloud.agent.AgentShell.launchAgentFromClassInfo(AgentShell.java:436)
at com.cloud.agent.AgentShell.launchAgent(AgentShell.java:420)
at com.cloud.agent.AgentShell.start(AgentShell.java:521)
at com.cloud.agent.AgentShell.main(AgentShell.java:551)

But port 8250 exists on the host.

netstat -anp | grep -i 8250
tcp6 0 0 192.168.3.55:8250 192.168.3.55:34584 TIME_WAIT -

However, when connecting via telnet, there is no connection.

root@s-16-VM:~# telnet 192.168.3.55 8250
Trying 192.168.3.55...
telnet: Unable to connect to remote host: Connection timed out

[TheKunalSen]

Allow the 8250 port on the host, or for now, disable the UFW by sudo ufw disable