Resolve git/ssh error: too many authentication failures

Oct 13, 2024#ssh #git58

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The issue arises from excessive SSH host rules without precise matching, leading to multiple key attempts and server rejections due to too many failures. **Solution:** Add precise matching in the SSH config file (`~/.ssh/config`) by including `IdentitiesOnly yes` for specific hosts and avoiding any proxy with `IdentityAgent none`. Example configurations are provided for GitLab and GitHub, specifying the necessary parameters for successful connections.

The main reason is that there are too many host rules configured for ssh, and there is no precise matching set. Additionally, with multiple keys present, ssh attempts each one, and before a successful match is found, it gets rejected by the server due to too many failed attempts.

Solution: Add precise matching in the host matching rules.

# ~/.ssh/config

Host gitlab.xxx.com
  HostName gitlab.xxx.com
  User root
  IdentityFile ~/.ssh/other_rsa
  # Add the following line for precise matching of the corresponding key
  IdentitiesOnly yes
  # And do not use any agent
  IdentityAgent none

# GitHub
Host github.com
  # for 443 port
  HostName ssh.github.com
  User git
  Port 443
  IdentityFile ~/.ssh/viki_rsa
  IdentitiesOnly yes

Host *
  User root
  IdentityFile ~/.ssh/viki_rsa
  PreferredAuthentications publickey
  IdentityAgent "xxx"