OpenSSH_8.4p1 Ubuntu-5ubuntu1, OpenSSL 1.1.1j 16 Feb 2021
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
ssh: Could not resolve hostname host: Temporary failure in name resolution