Connection Issues of TSN Evaluation Kits

I am a researcher at Hanyang University, Korea.
We have bought 11 TSN kits, and 9 of them can be well configured, but 2 of them cannot be connected, also my host cannot ping them successfully.
The led lights on 2 un-connected board look normally as the other good boards. Also, I used Wireshark to catch packet, PTPv2 packet from two boards can be observed.
Does TSN kit have the function to restore factory defaults? 
Moreover, are there some good solutions to solve this kind of issue?