Wazuh agent failed to start after upgrade (4.8 to 4.9)

[VenkataPatrana]

Wazuh version	Component	Install type	Install method	Platform
4.9	Agent	Upgrade	Packages (All in one Deployment)	Amazon Linux

After upgrading the Agent from 4.7 to 4.9, wazuh agent failed to start with reading XML error but started successfully after enabling the debug configuration on /var/ossec/etc/internal_options.conf agent.debug=1

Logs before enabling agent debug option

2024/10/03 20:31:25 wazuh-syscheckd: INFO: (1756): Shutdown received. Releasing resources.
2024/10/03 20:31:25 wazuh-syscheckd: INFO: (1225): SIGNAL [(15)-(Terminated)] Received. Exit Cleaning...
2024/10/03 20:31:25 wazuh-agentd[701738] sig_op.c:49 at HandleSIG(): INFO: (1225): SIGNAL [(15)-(Terminated)] Received. Exit Cleaning...
2024/10/03 20:31:25 wazuh-execd: INFO: (1314): Shutdown received. Deleting responses.
2024/10/03 20:31:25 wazuh-execd: INFO: (1225): SIGNAL [(15)-(Terminated)] Received. Exit Cleaning...
2024/10/03 20:31:25 wazuh-logcollector: ERROR: Remote commands are not accepted from the manager. Ignoring it on the agent.conf
2024/10/03 20:31:26 wazuh-execd: INFO: Started (pid: 709183).
2024/10/03 20:31:26 wazuh-agentd: ERROR: (1226): Error reading XML file 'etc/ossec.conf':  (line 0).
2024/10/04 03:41:37 wazuh-logcollector: ERROR: Remote commands are not accepted from the manager. Ignoring it on the agent.conf
2024/10/04 03:41:37 wazuh-agentd: ERROR: (1226): Error reading XML file 'etc/ossec.conf':  (line 0).

[VenkataPatrana]

@francobep can you please help me with this agent upgrade issue?

[gdiazlo]

Can you share with us the XML file? The error you're seeing means the file does not follow the XML format of the config file.