GitHub user midhunpjos closed a discussion: KVM | Cloudstack Agent Disconnected 
State Post Upgrade and Rollback

Hello Community,

I have tried a minor upgrade for cloudstack from 4.19.1 to 4.19.2, but the 
upgrade faced some issues and had to rollback. Post this the agents got 
disconnected and in logs below are observed.

How I can reissue the certificates in agent.



Management Logs
===================


2025-05-08 15:32:14,098 ERROR [c.c.u.n.Link] 
(AgentManager-SSLHandshakeHandler-119:null) (logid:) SSL error caught during 
wrap data: no cipher suites in common, for local address=/172.16.3.221:8250, 
remote address=/172.16.3.106:46046.
2025-05-08 15:32:14,100 INFO  [c.c.a.m.AgentManagerImpl] 
(AgentManager-Handler-12:null) (logid:) Connection from /172.16.3.106 closed 
but no cleanup was done.


Agent Logs
===================


2025-05-08 00:00:04,842 ERROR [utils.nio.Link] (main:null) (logid:) SSL error 
caught during unwrap data: Received fatal alert: handshake_failure, for local 
address=/172.16.3.106:49830, remote address=/172.16.3.221:8250. The client may 
have invalid ca-certificates.
2025-05-08 00:00:04,842 ERROR [utils.nio.NioClient] (main:null) (logid:) SSL 
Handshake failed while connecting to host: 172.16.3.221 port: 8250
2025-05-08 00:00:04,842 ERROR [utils.nio.NioConnection] (main:null) (logid:) 
Unable to initialize the threads.
java.io.IOException: SSL Handshake failed while connecting to host: 
172.16.3.221 port: 8250
        at com.cloud.utils.nio.NioClient.init(NioClient.java:67)
        at com.cloud.utils.nio.NioConnection.start(NioConnection.java:95)
        at com.cloud.agent.Agent.start(Agent.java:297)
        at com.cloud.agent.AgentShell.launchNewAgent(AgentShell.java:454)
        at 
com.cloud.agent.AgentShell.launchAgentFromClassInfo(AgentShell.java:431)
        at com.cloud.agent.AgentShell.launchAgent(AgentShell.java:415)
        at com.cloud.agent.AgentShell.start(AgentShell.java:511)
        at com.cloud.agent.AgentShell.main(AgentShell.java:541)
2025-05-08 00:00:04,843 INFO  [utils.nio.NioClient] (main:null) (logid:) 
NioClient connection closed
2025-05-08 00:00:04,843 INFO  [cloud.agent.Agent] (main:null) (logid:) 
Attempted to connect to the server, but received an unexpected exception, 
trying again...
com.cloud.utils.exception.NioConnectionException: SSL Handshake failed while 
connecting to host: 172.16.3.221 port: 8250
        at com.cloud.utils.nio.NioConnection.start(NioConnection.java:101)
        at com.cloud.agent.Agent.start(Agent.java:297)
        at com.cloud.agent.AgentShell.launchNewAgent(AgentShell.java:454)
        at 
com.cloud.agent.AgentShell.launchAgentFromClassInfo(AgentShell.java:431)
        at com.cloud.agent.AgentShell.launchAgent(AgentShell.java:415)
        at com.cloud.agent.AgentShell.start(AgentShell.java:511)
        at com.cloud.agent.AgentShell.main(AgentShell.java:541)
Caused by: java.io.IOException: SSL Handshake failed while connecting to host: 
172.16.3.221 port: 8250
        at com.cloud.utils.nio.NioClient.init(NioClient.java:67)
        at com.cloud.utils.nio.NioConnection.start(NioConnection.java:95)
        ... 6 more

GitHub link: https://github.com/apache/cloudstack/discussions/10836

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