Common Errors

Connection Errors

Error Code	Cause	Solution
Connection refused	Server not running or wrong port	Verify the service status: systemctl status sshd
Authentication failed	Incorrect credentials	Verify username/password or key file
No route to host	Network unreachable	Check network connectivity and firewall settings
Connection timeout	Network latency or firewall blocking	Adjust timeout settings and review network configuration

File Operation Errors

Error Code	Cause	Solution
Permission denied	Insufficient permissions	Verify file or directory permissions
No such file or directory	Incorrect path	Ensure the file path exists
Disk quota exceeded	Insufficient disk space	Clean up old files or request additional storage
File exists	File already exists	Use overwrite option or rename the file

Troubleshooting

1. Verify that your network connection is stable and the host is reachable

telnet sftp.oceanpayment.com 226

2. Check Service Status

systemctl status sshd
tail -f /var/log/secure

3. Check Firewall / Security Groups / IP Whitelist

• Local environment:

sudo iptables -L -n
sudo ufw status

• Cloud environment(AWS / GCP / Azure): Make sure your IP can access port 22 or 226 via Security Groups or Firewall settings.
• Oceanpayment with IP Whitelist enabled: Confirm your IP is included in the approved whitelist.