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SSH & X11 forwarding

Hi list members,

I have not used X11 over ssh for years now. But today is the day! And it does not work....
The remote console tells me 'Xt error: Can't open display: :0'.
X11Forwarding is enabled on client and server, 'xhost +' on the client, DISPLAY is set. IPv6 is disabled on both ends with sysctl and in sshd_config. Client runs with xfce.

What did I miss?