This checklist provides an approach to diagnosing and resolving common issues that might prevent the login page from displaying properly.

• Check available disk space: df -h
• Check CPU Usage: top
• Check RAM Usage: free -m
  • Look for available parameter.
  • It is ok to have very few free memory as long as available provides enough memory for the JAVA maximum allocated to grow fully.

• Confirm ports are not being used by another service: netstat -tulnp | grep [port_number]
  • Application ports are specified in setenv.sh
  • Default ports: 8888/8443 (collector) and 8080/8443/8444 (cockpit).
• Check firewall rules: iptables -L or firewall-cmd –list-all
  • Firewall must not block incoming connections on application ports
  • Allow port : firewall-cmd –zone=public –add-port=[port_number]/tcp –permanent
  • Reload Firewall rule sudo firewall-cmd –reload

• Ensure the application services are running systemctl status promonitor / systemctl status promonitor-cockpit
• Restart Service sometimes helps to recover: systemctl restart promonitor / systemctl restart promonitor-cockpit
• Look for recent errors or messages in the application logs → tail -f server.log

• Dependency Issues:
  1. Service Status Check: Verify the status of MySQL and VictoriaMetrics → systemctl status mysqld.service, systemctl status victoriametrics.service
  2. Reinstall Missing Dependencies: Reinstall missing dependencies → apt-get install –reinstall mysqld or yum reinstall mysqld

• Permission and Ownership Errors:
  1. Verify File Permissions: Check for correct permissions → ls -l /opt/Pro.Monitor

• Basic Checks:
  1. Verify Licenses expiration and the number of system allowed

• Basic Checks:
  1. Verify SAP JCO/SAP HANA driver installed