Connection Issues

Common questions and answers about SSH connections.

Connection Failure

Connection timeout?

Possible reasons:

Wrong server address or port
Network unreachable
Firewall restrictions
SSH service not running

Solutions:

Confirm server address and port
Check network connection
Contact server administrator

Connection refused?

Reasons:

SSH service not running
Port occupied or modified
Firewall blocking

Solutions:

Confirm SSH service status
Check port configuration
Check firewall rules

Host key verification failed?

Reasons:

Server fingerprint changed
Possible security risk

Solutions:

Confirm server change is normal
Delete old fingerprint
Re-accept server fingerprint

Authentication Issues

Password authentication failed?

Check:

Username is correct
Password is correct
Keyboard layout

Key authentication failed?

Check:

Key file path
Key passphrase
Key format

Permission denied?

Possible reasons:

User not allowed
Wrong authentication method
Server configuration

Network Issues

Connection unstable?

Possible solutions:

Use stable network
Adjust timeout settings
Use keep-alive

Slow connection?

Possible solutions:

Check network speed
Reduce terminal output
Disable unnecessary features

SSH Connection - SSH features
Connection Failed - Troubleshooting guide