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古いマシーンに ssh 接続できない時の対策

Last updated at 2020-06-13Posted at 2020-06-10

Amazon Linux 2 や、CentOS 8 からは ssh 接続できても、Arch Linux や、Ubuntu 20.04、Alpine Linux から　ssh 接続できないマシーンがありました。

$ ssh aaa@133.110.23.29
Unable to negotiate with 133.110.23.29 port 22: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1

解決方法　.ssh/config を作成

.ssh/config

HOST 133.110.23.29
KexAlgorithms +diffie-hellman-group1-sha1
Ciphers aes128-cbc

接続して OS の様子を見ると

$ uname -a
Linux *** 2.4.20-46.7.legacy #1 Sat Mar 4 15:25:19 EST 2006 i686 unknown
$ cat /etc/redhat-release 
Red Hat Linux release 7.3 (Valhalla)

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