When using log forwarding to another Aria Operations for Logs cluster using Ingestion API (CFAPI) over port 9000, no logs are being seen on the receiving cluster end.
Aria Operations for Logs 8.x
When configuring the log forwarding, check the box for 'Use SSL' and use default port 9543.
Check Enforce SSL-Only Connections as well on both clusters.
If there is a certificate present that has not been trusted you will receive a popup message. Trust the certificate and save the configuration.
If you have a need to send non-encrypted traffic, adjust the setting for "Require SSL Connection" as mentioned in VMware Aria Operations for Logs Server Rejects the Connection for Non-Encrypted Traffic