No more authentication methods to try,Permission denied (publickey)

簡言之就是ssh client更新了，不支持rsa的私鑰，導致無法登陸。

ssh登陸服務器，出現類似下面的提示：

debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /home/user/.ssh/id_rsa RSA ... agent
debug1: send_pubkey_test: no mutual signature algorithm <-- ssh-rsa is not enabled 
debug1: No more authentication methods to try.
user@hostname: Permission denied (publickey).

本來以爲是key弄錯了，或者服務器被hei了。加上 -v 參數才發現問題。

解決方案也很簡單，就是在 ~/.ssh/config 中增加:

Host *
    ServerAliveInterval 30
    PubkeyAcceptedKeyTypes +ssh-rsa

具體原因： https://www.openssh.com/txt/release-8.2 參考：https://confluence.atlassian.com/bitbucketserverkb/ssh-rsa-key-rejected-with-message-no-mutual-signature-algorithm-1026057701.html