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Ubuntu 20.04 で 古いサーバーにssh接続がエラーで接続できない場合

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対応

Unable to negotiate with UNKNOWN port 65535: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

 Host oldserver
+    KexAlgorithms +diffie-hellman-group1-sha1
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