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...nt (The west-coast is stored on the jump host in between in /etc/hosts.) $ ssh -J root at 167.235.141.44 root at west-coast Works as expected. Also $ ssh root at 2a01:4f8:1c1e:528d::1 does work as expected. I do have native IPv6. This is on Debian 12 Bookworm: $ ssh -V OpenSSH_9.2p1 Debian-2+deb12u2, OpenSSL 3.0.11 19 Sep 2023 The workaround seems to be to define the host used in ProxyJump in ~/.ssh/config then it works with IPv6 too. Yes, I known I should use IPv6 with DNS which is not the point here. What have I overlooked? Thank you for any help. Adam Kalisz