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Do I need to somehow portforward port 21 for filezilla in my router settings?
Not somehow, definitely. But forwarding the listening port is only one step, there is much more you need to do. Please read our Network Configuration guide where this is explained in detail (''Setting up and testing FileZilla Server'').For testing, always use http://ftptest.net as your external IP doesn't work if in the same LAN as the server is.