Truenas Scale Electric Ele Gameserver Minecraft,Palworld,7 Days, ARK

Hello everybody,
i need some help and maybe someone knows a thing.

I have multiple Gameserver on my Truenas Scale Electric Ele Server

And i have a DynDNS pointing to my Router.

I Have Deutsche Glasfaser as Provider without own ipv4.

so a Friend of me hast Deutsche Glasfaser too, and he can join every off my Gameservers over my DynDNS + Port.

BUT Everyone else, who not have Deutsche Glasfaser as Provider cant join my Gameservers, has anyone an Idea Why ?

Best Regards Sebastian

It sounds like Deutche Glasfaser is not providing a routable public IP address.

Get the IP address and see where you can ping to. Can others ping you?