Zscaler NSS integrate issue with SIEM Qradar

We have launch NSS image on AWS and we are facing issue to integrate with Qradar, i am not sure any configuration miss match.

when i run the command "sudo nss troubleshoot netstat " it is display TCP SYN_SENT " state to Qradar.

and showing Established with ZSCloud IP on port 443.

I don’t understand in between NSS and SIEM we have enabled port 514 udp and communication get initiated with TCP ( SYNC ) how it is ? we have to enable any port to communicate with Qradar. ?

Please help to provided resolution on this.