NAS Access Denied Due to IP Blocking
Applicable Products
NAS (QTS / QuTS Hero)
Scenario
To protect against malicious attacks, QTS has a built-in IP Blocking mechanism (IP Access Protection). This mechanism automatically blocks the source IP address when repeated incorrect login attempts or suspicious connection behavior are detected, preventing brute force attacks or malicious access to the NAS. A user is unable to access the NAS through the QTS web interface, SSH, or file sharing. It is suspected that the issue may be caused by IP blocking on the NAS.
Possible Causes
The NAS has IP access control enabled, blocking the specific computer.
The computer’s IP address has been added to the NAS blacklist.
Firewall or network security settings are preventing the connection.
Solution
Test with another computer
Try accessing the NAS (QTS web, SSH, or file services) using another device on the same network.
If the other device can connect successfully, the original computer’s IP is likely blocked.
Change the computer’s IP address
Manually assign a different IP to the affected computer (or renew DHCP).
Retry the connection to confirm if changing IP bypasses the block.
Check NAS blacklist settings
Log in to QTS from a device that can still connect.
Go to Control Panel > Security > IP Access Protection or firewall settings to see if the IP is blocked.
Restart the NAS as a last resort
If no devices can connect to the NAS, consider restarting it.
After rebooting, attempt to connect from a different device to verify if IP control was the cause.
How to Prevent Future IP Blocking
Whitelist trusted IPs: Add administrator computers to the whitelist in firewall or network access protection.
Avoid repeated login failures: Multiple failed login attempts may trigger automatic IP blocking.
Review security settings regularly: Periodically check blacklist and firewall rules to ensure admin devices are not mistakenly blocked.
Further Reading
Why is my device unable to access my QNAP NAS
Để được hỗ trợ thêm, hãy hỏi những người dùng khác và chuyên gia QNAP trong cộng đồng. Đến Cộng đồng QNAP
