Problem with remote KNX programming on port 3671

[Kilogica]

Hello,

I try to reach a Wiser for KNX in ETS but I can't.

I opened port 3671 TCP/UDP on router and 443, on https no problem but ETS cannot reach (not even with NAT mode activated).

I asked the ISP to see if they block something but they confirmed that they don't.

What could it be? Any ideas?