When using the DS file app to access your Synology NAS, encountering the error "The IP address has been locked" can be frustrating and disruptive. This issue typically occurs when the NAS's security features detect multiple failed login attempts from a specific IP address, leading to an automatic block. While this mechanism is designed to protect your data, it can cause inconvenience if you’re locked out unintentionally. The good news is that there are straightforward ways to resolve this issue and prevent it from happening again.
In this guide, we’ll walk you through actionable steps to regain access to your NAS, troubleshoot the root cause of the lockout, and implement best practices to avoid future disruptions. By the end of this guide, you’ll not only resolve the current issue but also enhance your NAS security setup while ensuring smooth access for authorized users.
Quick Reference
- Log in to your Synology DSM using a trusted device to unblock the locked IP.
- Check and adjust the Auto Block settings in the Security section of DSM.
- Whitelist trusted IP addresses to prevent accidental lockouts.
Step 1: Understanding the IP Lockout Mechanism
Before jumping into solutions, it’s important to understand why Synology’s DSM locks IP addresses. This feature, known as Auto Block, is designed to protect your NAS from brute-force attacks or unauthorized access attempts. If too many failed login attempts occur within a short period, the IP address in question is automatically blocked for a predetermined time or until manually unblocked.
This is a valuable security feature, but it can unintentionally lock out legitimate users in scenarios such as:
- Entering the wrong credentials multiple times while logging in.
- Network misconfigurations causing repeated failed connection attempts.
- Third-party apps or devices trying to connect with outdated credentials.
Now that you know why this happens, let’s move on to resolving the issue.
Step 2: Unblocking the Locked IP Address
The first step to regain access is to unblock the locked IP address through the Synology DSM interface. Here’s how to do it:
- Log in to DSM using a different device or network: If your current device is locked out, switch to another device or use a mobile network (if your NAS is accessible over the internet). Alternatively, you can access DSM from a device with a different IP address.
- Access the Control Panel: Once logged in, navigate to the Control Panel from the main menu.
- Go to Security Settings: In the Control Panel, click on Security and then select the Account tab.
- View and manage blocked IPs: Locate the Auto Block section and click Allow List or Block List. Here, you’ll find a list of IP addresses that have been blocked.
- Unblock the IP: Select the locked IP address and click Remove or Unblock to restore access.
Once this is done, test your connection to ensure the lockout has been resolved. If the issue persists, proceed to the next steps to address potential underlying causes.
Step 3: Adjusting Auto Block Settings
If you frequently encounter lockouts, it may be worth adjusting the Auto Block settings to better suit your usage patterns. Follow these steps:
- Access Auto Block settings: In the Security section of the Control Panel, locate the Auto Block feature.
- Modify the threshold: Adjust the number of failed login attempts and the time window that triggers a block. For instance, you might increase the allowed failures from 5 to 10 or extend the time window from 5 minutes to 10 minutes.
- Set a block duration: Specify how long an IP address should remain blocked. A shorter duration, such as 30 minutes, can minimize disruptions while maintaining security.
- Enable notifications: Turn on email or push notifications for Auto Block events so you’re immediately informed if an IP is locked.
These tweaks can help reduce accidental lockouts without compromising the security of your NAS.
Step 4: Whitelisting Trusted IP Addresses
To prevent frequent lockouts from specific devices or networks, you can whitelist their IP addresses. Whitelisted IPs are exempt from Auto Block, ensuring uninterrupted access. Here’s how to set this up:
- Open the Allow List: In the Auto Block section of the Security settings, find and click Allow List.
- Add trusted IPs: Enter the IP addresses or IP ranges you trust (e.g., your home network or work network). Use the correct format to avoid errors.
- Apply changes: Save your settings to activate the whitelist. Double-check that the IPs you entered are accurate to prevent unintended access issues.
By whitelisting your frequently used IPs, you can strike a balance between security and convenience.
Step 5: Troubleshooting Persistent Lockouts
If the lockout issue continues despite following the above steps, consider these additional troubleshooting measures:
- Update credentials on all devices: Ensure all apps, devices, and services that connect to your NAS are using the correct username and password. Outdated credentials can cause repeated failed login attempts.
- Check for unauthorized access attempts: Review the DSM Log Center for suspicious activity. If you notice unknown IPs trying to log in, consider strengthening your NAS’s security (e.g., enabling two-factor authentication).
- Restart your router: If you’re using a dynamic IP address, restarting your router can assign a new IP, potentially resolving the lockout.
- Upgrade DSM firmware: Ensure your Synology NAS is running the latest version of DSM, as updates often include security and performance improvements.
These steps can help identify and address the root cause of repeated lockouts.
Step 6: Strengthening NAS Security
Finally, take proactive measures to enhance the security of your Synology NAS and reduce the likelihood of future IP lockouts:
- Enable two-factor authentication: Add an extra layer of security by requiring a one-time code in addition to your password.
- Use strong passwords: Avoid common or easily guessable passwords. Use a mix of uppercase, lowercase, numbers, and special characters.
- Limit admin account usage: Create individual user accounts with appropriate permissions instead of relying on the admin account for everyday access.
- Restrict external access: If you don’t need remote access, disable it to reduce the attack surface.
- Regularly review logs: Periodically check the DSM logs for any unusual activity.
By implementing these best practices, you can keep your NAS secure while minimizing access disruptions.
How do I access my NAS if I don’t have another device or network?
If you can’t use another device or network, try restarting your router to obtain a new IP address (if using a dynamic IP). Alternatively, connect to your NAS locally using its LAN IP address, bypassing external network restrictions.
Can I temporarily disable Auto Block to avoid lockouts?
Yes, you can disable Auto Block in the Security settings, but this is not recommended as it leaves your NAS more vulnerable to unauthorized access. If you disable it temporarily, re-enable it as soon as possible.
What should I do if my Dynamic DNS setup is causing repeated lockouts?
Verify that your Dynamic DNS settings are correctly configured and that the credentials used for updates are accurate. If issues persist, whitelist the IP range used by your Dynamic DNS provider.