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Wireshark will not help here, as a gentle reminder Wireshark is a packet analyser, e.g. a microscope and not a network swiss army knife.
More appropriate tools for the task would be netstat or lsof on the server host to determine if the ports are open, and if so, by which process.
Your use of a private local IP address (192.168.0.15) is confusing me. This address is not routable over the internet and cannot be connected to from a host outside of your local LAN. You can use port forwarding on your firewall so that external connections to the external internet IP of the firewall are forwarded on to the local IP.
You could help by adding some basic info to your question such as where and what the server is and where and what the client is and any known intervening devices such as firewalls.
