For this issue, we can refer to the < HUAWEI TP31XX&TP32XX&RP Telepresence System Troubleshooting Cases>. Chapter 5/6. You can find detailed case. But for this case, it`s out of the them. First we need to check it`s http disconnect or telnet disconnect. In this picture, it is telnet.
If it`s telnet disconnect. Usually it`s we didn`t configure the IP of the host. Or in the host, we didn`t configure the alternate IP.addr of the terminal.
We check the below settings, it`s all correct. And we have already configure the apiuser/(null).it`s already default, but still can`t connect.
So we check this issue in turn. first we configure our laptop into 172.16.21.10, it means try to connect terminal to check whether it`s available.
telnet terminal via apiuser/(null), we find we can`t login in, it means that the default username/password is changed. In the doc. it didn`t mentioned.