IP address setting differences between RT-BOX and RT-LAB

Yesterday I install the RT-LAB software to connect it to opal-rt5700 and I changed my IP address setting in network seeting and share center in my windows system. But today I found that I can’t connect my PC host to the RT-BOX 1 , but actually I can connect to my RT-BOX the day before yesterday ,so what’s wrong?

The error message:Target response -32300, Host unreachable

Maybe I have found the anwer, it’s just a problem of manually assinged Ip address and automatically assigned IP address.RT-lab is the former one.