Fix "Too Many Authentication Failures"

Understanding the Error

SSH has a maximum number of authentication attempts (default: 6). After exceeded attempts, SSH disconnects to prevent brute force attacks.

Received disconnect from IP: 2: Too many authentication failures

Fix 1: Use Specific Authentication Method

If you have many SSH keys loaded, SSH tries each one. Force a specific method:

# Use password only
ssh -o PreferredAuthentications=password hxroot@YOUR_IP

# Use specific key file
ssh -i ~/.ssh/yourkey -o IdentitiesOnly=yes hxroot@YOUR_IP

Fix 2: Clear SSH Agent Keys

List loaded keys:

ssh-add -l

Clear all keys from agent:

ssh-add -D

Then reconnect.

Fix 3: Disable Key Authentication Temporarily

ssh -o PubkeyAuthentication=no hxroot@YOUR_IP

Fix 4: Increase MaxAuthTries on Server

Edit SSH config (requires console access):

sudo nano /etc/ssh/sshd_config

Add or modify:

MaxAuthTries 10

Restart SSH:

sudo systemctl restart sshd

Fix 5: Use ControlMaster to Reuse Connections

ssh -o ControlMaster=auto -o ControlPath=~/.ssh/control-%r@%h:%p hxroot@YOUR_IP

Fix 6: Check for Brute Force Attack

If seeing this error without trying multiple times, someone may be attacking:

sudo tail -f /var/log/auth.log | grep "Failed password"

Implement fail2ban:

sudo apt install fail2ban -y
sudo systemctl enable fail2ban --now