The first key-exchange algorithm supported by the server is diffie-hellman-group1-sha1? - Ask Ubuntu


after upgrated serve ubuntu 16.04. warnings come out when log on linux serve(ubuntu 16.04) putty.

warning: first key-exchange algorithm supported server diffie-hellman-group1-sha1, below configured warning threshold. want continue connection?

$ lsb_release -a no lsb modules available. distributor id: ubuntu description:    ubuntu 16.04.1 lts release:        16.04 codename:       xenial

according release notes:

support 1024-bit diffie-hellman-group1-sha1 key exchange disabled default @ run-time. may re-enabled using upstream instructions.

as mentioned here need use

ssh -okexalgorithms=+diffie-hellman-group1-sha1 user@legacyhost

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