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Configure sshd for Plan 9

By default, OpenBSD's sshd(8) enforces the use of stronger cryptography. In order to connect from Plan 9, some security settings need to be loosened.

NOTE: Avoid using these settings unless you need to ssh in from Plan 9.

PubkeyAcceptedAlgorithms +ssh-rsa
KexAlgorithms +diffie-hellman-group1-sha1
HostkeyAlgorithms +ssh-rsa
Ciphers +aes256-cbc