How to reset / restore factory default SANGFOR NGAF M5100F-I? 5

I have sangfor NGAF M5100F-I configured and already working. However, yesterday it just not giving an internet connection to eth3, so all I need is to check its sangfor. Unfortunately, it says "Sorry, page not found", i don't know what to do to access its WEBGUI, i tried to check it in Manage Port but still I got the same scenario. I tried firmware updater but it says Connection Refuse.

HiHi,

Please find the link below regarding a similar issue for your reference:

https://community.sangfor.com/forum.php?mod=viewthread&tid=898&highlight=

Hi
It sounds like you’re facing a problem with the Sangfor NGAF M5100F-I where you're unable to access the WebGUI (management interface), and the device is also not providing internet connectivity on eth3. Let’s break down the possible causes and solutions:

Steps to Troubleshoot
1. Check Device Connectivity
Physical connections: Make sure all physical connections (cables, ports, etc.) are intact and the network interface (eth3) is connected properly.
Ping the device: Test if the device is reachable by pinging its IP address from a connected system. If the ping fails, there may be a network or device issue.
2. WebGUI “Page Not Found” Error
Incorrect URL: Double-check the IP address or URL used to access the WebGUI. The URL should be something like https://<device_ip>:port.
If you've customized the management port during configuration, ensure you're using the correct port (e.g., https://192.168.1.1:443 or :8443).
HTTPS instead of HTTP: Make sure you're using https:// to connect securely.
Try different browsers: Sometimes browser compatibility can cause issues. Try accessing the WebGUI using a different browser like Chrome, Firefox, or Edge.
Clear browser cache: Cached data might be causing the issue. Clear your browser cache or use incognito mode.
3. Check the NGAF Management Port
Since you mentioned trying the Manage Port, ensure the port for management is correctly configured:

Log into the command-line interface (CLI) using SSH or a direct console connection if you can’t access the WebGUI.
Verify the management port settings: You can check the network and port settings using the CLI. Make sure the port assigned for Web management is active.
You may also try restarting the management services via the CLI.
4. Firmware Issues and Connection Refused
Firmware connection refused: The “Connection Refused” message when attempting a firmware update could be caused by firewall rules or the firmware update server being inaccessible.
Manual firmware update: If automatic updates aren’t working, you can download the latest firmware package from the Sangfor support portal onto a USB stick or your computer and manually upload it via the WebGUI or CLI.
Check firewall rules: Ensure that the firewall policies on the NGAF device aren’t blocking the management interface or the firmware update server.
5. Restart the NGAF Device
Sometimes, simply restarting the device can resolve issues with network connectivity and management services. You can do this via the CLI or by power cycling the device.
6. Check Logs for Errors
If you can access the CLI, check the system logs for any error messages related to the eth3 interface, WebGUI, or system services.
Common commands:
show system log
show interface eth3 (to see if there are any errors related to the port)
7. Reset the Device (Last Resort)
Backup configuration: Before resetting, make sure you have a backup of the device’s configuration.
Factory reset: If all else fails, consider performing a factory reset on the device. This will clear all configurations, so it should only be done if you have a saved backup of the device settings.

To reset the Sangfor NGAF M5100F-I to factory default, you need to access the device through the console port using SSH or a serial connection. After logging in with the appropriate credentials, use the command reset factory-settings to initiate the reset. Also sure you have backed up the configuration if needed, as this will wipe all settings. After the reset, the default management IP is usually set to 192.168.1.1. You can then access the WebGUI by connecting a PC to the management port and navigating to this IP in a browser.