I came back to the 40m and started the investigation.
If I ping 192.168.113.92, it responds. But telnet (port 23) was rejected. I somehow tried ssh and it responds! I even could login to the host using usual password. Here is the prompt.
controls@nodus|~> ssh 192.168.113.92
controls@192.168.113.92's password:
...
controls@c1sus2:~ 0$
Oh no...
Looks like c1sus2 and the videomux have the IP address conflict.
Here are the useful ELOG links:
https://nodus.ligo.caltech.edu:8081/40m/4498
https://nodus.ligo.caltech.edu:8081/40m/4529 |