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client1$ ssh -v <user>@<server>
OpenSSH_8.4p1 Debian-5+deb11u1, OpenSSL 1.1.1n 15 Mar 2022
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line <no>: Applying options for *
debug1: Connecting to <server> [<ip>] port 22.
debug1: connect to address <ip> port 22: Connection refused
... IP6 geraffel
ssh: connect to host ssh.strato.de port 22: Connection refused
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client1$ ssh localhost
client1$ shh <anderer server>
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client2$ ssh -vvv <user>@<server>
OpenSSH_7.9p1 Raspbian-10+deb10u2+rpt1, OpenSSL 1.1.1n 15 Mar 2022
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to <server> [<ip>] port 22.
debug1: Connection established.
... ganz viel Detailgeraffel