1. Verify that you can login into the Controller and successfully reach a landing page with data. Some Controllers can only be accessed through a tunnel
2. Is the Controller link down? link down functionality
3. Is the software version supported. – check supported technologies & software versions here here
4. Are the assigned login credentials correct and not null at the controller level? Controller Login values
5. Is the correct IP address assigned to the controller?
6. Does the Controller require a port number i.e. 8080? This can be verified by logging into controller.
7. Is the correct discovered trap configuration value assigned to the Controller and Child elements?
8. Is the correct http session manager configuration assigned to the controller?
9. Is the correct alarm sync configuration assigned to the controller?

Run the following query on the Controller been investigated.

  select id, name, technology, software_version ip_address, port, link_down, login_credentials_id, http_session_manager_configuration_id, alarm_sync_setting_id, discovered_trap_configuration_id  from network_element where id = <network  element id>;
  

Verify that none of the following values are null:

• ip_address
• login_credentials_id
• http_session_manager_configuration_id
• alarm_sync_setting_id
• discovered_trap_configuration_id
• software_version

• Missing or incorrect disabled_alarm_parse_script_id in assigned alarm sync setting
• verify that the alarms sync path contains a valid entry for the disabled alarm.
• If technology does not support disabled alarms assign a “NO DISABLED ALARMS” script in alarm sync setting

• Missing login_credentials_id
• Incorrect login_credentials_id assigned to controller.
• UI issues on the controller login page, confirm & report to customer

• Incorrect login_credentials_id assigned to controller.
• If error message contains OID check if snmp values are correct and manually run command
• UI issues on the controller login page, confirm & report to customer

• Missing login_credentials_id
• Incorrect login_credentials_id assigned to controller.

• Confirm that alarm severity sync has run
• Verify that only one ALARM_SEVERITY_SYNC is assigned to controller, remove duplicates.

select * from network_element_sync_setting where job_type = 'ALARM_SEVERITY_SYNC'  and 
network_element_id = <network  element id>;

• The discovered_trap_configuration_id is missing for referenced element