Thank you for the post @JimMcGrady
I am not aware of any equivalent of TCP ping in PAN-OS and I do not believe such feature exists. When I have to do some basic verification of reachability from Firewall against certain TCP port, I am using SSH. For Example below sample:
When I get a response that it was closed by remote host, I know there was a response. I know it is limited and completely corresponding with your requirement, but this might be one of the workaround.
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