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It depends on your configuration.

Edit => Preferences => Protocols. Then pick your protocol and see on which port(s) it will normally detect.

If you hit traffic on another port then it will not be decoded b default. However you can just right click on a relevant packet (SYN packets are not the best for this) and tell Wireshark to decode traffic on this port as the protocol you want.

If this hapens a lot I suggest you add the port to protocol settings. If it only happens once I wouldn't bother with that.

Regards, Hugo.