It seems that in Debian 8 (OpenSSH 6.7), diffie-Hellman-group1-sha1 is disabled by default. A client that connects via SSH receive the error:
Server does not support diffie-hellman-group1-sha1 for keyexchange
I tried adding
Code: KexAlgorithms diffie-hellman-group1-sha1,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sh Example
KexAlgorithms diffie-hellman-group-exchange-sha256,curve25519-sha256@libssh.org
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