Stealth Ports on SonicWall Pro 4060

Hi all, a customer has a SonicWall Pro 4060. I enabled the Staelth mode on the firewall,  I did a test through Shields Up. All the ports which are not being used are marked as stealth. But open ports are still visible as Open from outside.

Does anyone has any idea how to stealth certain ports?

Thanks in advance
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If the ports are open then they cannot be hidden/stealthed. The nearest you could get to that would be to restrict access based on the source address (or addresses). If the open port is only connected to from one or two known and fixed addresses then use the firewall rules to restrict access. If it needs to be reachable from any address on the Internet then just make sure the service that is being reached is secure - e.g. through the use of passwords etc.

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