Access point cannot connect to the SZ100

[jason_ng_5d5ro3]

Hi,
We are deploying a new SZ100 with H320 Access Points, after configuring the SZ100 and set the controller IP into the H320, I found that the APs do not connect to the SZ100. APs and SZ100 are in the same subnet and they can also ping each other. From the Controller event, i do not see any logs which related to the AP registration. Do you have any ideas?

Here is the software version of the AP and controller:
AP Software Version: 110.0.0.0.663

Controller version: 3.5.1.0.296
Control Plane Software version: 3.5.1.0.205
Data Plane Software version: 3.5.1.0.95
AP Firmware Version: 3.5.1.0.419

Best regards,

Jason NG