Data Aggregator fails to synchronize with Performance Management with selinux enabled

Document ID : KB000101432
Last Modified Date : 19/06/2018
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After the systems had maintenance performed or were restarted for other reasons, the CA Data Aggregator shows synchronization failure in CA Performance Managements CA Performance Center web UI.

The services are all running and a Test of the Data Aggregator Data Source from Manage Data Sources 

The following error is observed in the CA Performance Center caperfcenter_console PC service PCService.log file.

We see this error in the PCService.log:
ERROR | RIB/VendorCertsCacheScanner | 2018-06-13 09:32:54,102 |
      | Error while connecting to http://<DA_HOST>:8581/genericWS/certifications No route to host

The network communications between hosts appears to work well, and /etc/hosts is configured properly. Why is this error occurring?
All supported CA Performance Management releases
In the CA Performance Management CA Performance Center server selinux is enabled.
The selinux tools must be either disabled or in fully Permissive mode in order to have a properly functioning CA Performance Management environment.

Disable selinux or configure it as Permissive and restart all server services.
Additional Information:
Permissive is allowed as it only performs logging and doesn't actually prevent activities from taking place as required.