Palo Alto stopped logging traffic to Splunk

I am having the same issue as: https://answers.splunk.com/answers/507167/why-are-my-palo-alto-firewall-logs-not-forwarding.html . Palo Alto has stopped logging traffic to Splunk after we performed an OS patch (RHEL 7.5) on the Splunk server and then performed a reboot on the Splunk server - in this case a search head. The splunkd.log didn't reveal anything other than the fact that it stopped sending messages after the Splunk server reboot. No changes were made to the PA firewall appliance nor any sort of configuration changes on the Splunk server prior to the patch/reboot. Everything was working fine prior to the patch and reboot - which is still working, other than the PA logs. A systemctl status splunk shows that all services are enabled, active and dislays what you would expect. There isn't much information on the forums regarding this specific topic, any help would be greatly appreciated.