Hi Nam, we have documented the ZD default certificate recovery process in KBA-1145.
I hope this is helpful.
https://support.ruckuswireless.com/answers/000001145 Troubleshooting Steps
1. ping ZD's IP address, and get reply.
2. try to web log in ZD. but we cannot web log in ZD.
3. try to ssh log in ZD, and get login prompt ok.
Workaround
If the ZoneDirector will ping/ssh but not open WebGUI, follow the below procedure to reset/restore the ZD certificate:
•
SSH into your ZD, login with your admin credentials and you can reset
your certificate through the command interface and this will restart
your Zone Director when reset.
Ruckus> en
Ruckus# config
Ruckus (config)# certificate
Ruckus (config-certificate)# restore
• Zone Director will restart now to apply the changes in the certificate settings.