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TLDR;

TLDR

sshd running on CentOS 8

sshd running on CentOS 7

• Combining / splitting the Match statements for IPv4 and IPv6 does nothing
• sshd does not log any config error in var/log/secure
• Not a client problem - tried OpenSSH, PuTTY, WinSCP and got the same error

• Combining / splitting the Match statements for IPv4 and IPv6 does nothing Match Address 169.254.0.0/16,192.168.0.0/16,fe80::/10 This doesn't work either.
• Putting the IPv6 address in square brackets Match Address [fe80::]/10 No bueno.
• sshd does not log any config error in var/log/secure
• Not a client problem - tried OpenSSH, PuTTY, WinSCP and got the same error