Synology NAS Error Code 70: How to Fix It

Medium 20-40 minutes Medium Severity Verified June 2026
Summarize with ChatGPTSummarize with ClaudeSummarize with Perplexity Add as Preferred Source on Google
Error Code
70
Brand
Synology
Product Type
nas
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
20-40 minutes
Synology DSM error code 70 indicates that the VPN connection to your Synology NAS has been refused. This typically occurs when the VPN server or client configuration is incorrect, ports are blocked, or authentication fails. Follow these steps to diagnose and resolve the issue.
Ad

Tools You'll Need

How to Fix Error Code 70

  1. Check VPN Server Status

  2. Verify VPN Protocol Settings

  3. Check Firewall and Router Port Forwarding

    Changing firewall settings can expose your network; only open necessary ports.

  4. Test VPN Client from Within Local Network

  5. Review VPN Logs

  6. Reset VPN Server Configuration

    Resetting will remove existing VPN users; you'll need to recreate them.
Ad

When to Call a Professional

If you've completed all steps and the error persists, consider contacting Synology support or a network specialist. Issues with complex router configurations or ISP-level restrictions may require professional assistance.

Frequently Asked Questions

What causes Synology NAS error code 70?
Error 70 usually means the VPN connection is refused due to incorrect port forwarding, firewall rules, authentication failure, or protocol mismatch between server and client.
How do I open ports for Synology VPN?
Log into your router's admin panel, find Port Forwarding section, and forward the following ports to your NAS's local IP: 1723 (PPTP), 1194/UDP (OpenVPN), 1701, 500, 4500 (L2TP/IPSec).
Can I fix error 70 without resetting my NAS?
Yes, most causes are configuration or network issues. Check firewall, port forwarding, VPN protocol settings, and user credentials before resetting. Only reset if logs show no clear cause.
Does Synology VPN support PPTP?
Yes, Synology VPN Server supports PPTP, OpenVPN, and L2TP/IPSec. However, PPTP is outdated and less secure; consider using OpenVPN for better security.
Why does VPN work locally but not remotely?
This indicates port forwarding or public IP issues. Ensure your router forwards VPN ports to the NAS and that your public IP is correct (dynamic DNS may be needed if IP changes).

Related Error Codes