====== **WARNING: THIS PAGE IS NOT APPROVED YET** ======
====== Checklist Guide ======

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

===== [Common] No Login Page =====
==== Check OS resources ====

  * 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.

==== Check Network ====

  * 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''

==== Check Application Service ====
  * 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''

==== Dependencies ====
  * **Dependency Issues:**
    - **Service Status Check**: Verify the status of MySQL and VictoriaMetrics -> ''systemctl status mysqld.service'', ''systemctl status victoriametrics.service''
    - **Reinstall Missing Dependencies**: Reinstall missing dependencies -> ''apt-get install --reinstall mysqld'' or ''yum reinstall mysqld''

  * **Permission and Ownership Errors:**
    - **Verify File Permissions**: Check for correct permissions -> ''ls -l /opt/Pro.Monitor''

=== [Pro.Monitor] Can't create system ===
  * **Basic Checks:**
    - Verify Licenses expiration and the number of system allowed

=== [Pro.Monitor] Connector not working ===
  * **Basic Checks:**
    - Verify [[products:promonitor:6.8:installguide:installdrivers|SAP JCO/SAP HANA driver]] installed