If you failed to connect VXDIAG VCX SE interface unit via WiFi, here is the possible solution.
Connect VCX SE with the vehicle via OBD connector
Wait the WiFi indicator turns on
Click on WiFi icon on laptop.
Search WiFi name starting with DoIP-VCI-****, if vcx nano series, find WiFi name VCX-WiFi
Tick Connect automatically and Connect.
Enter WiFi password: 123456789 and press Next
Verify connection.
Connect with WiFi successfully.
Then run VX Manager
Press ReConnect function after 20 seconds.
The vxdiag vcx se connects with WiFi successfully.