Answer:
This is a connectivity issue/problem.
Explanation:
As the system admin or support technician, I would want to confirm whether these users are indeed connected to the internet or not. I’d also check whether the intranet site is hooked up and try to find out whether there is a scheduled maintenance that I am not aware of. I would also want to confirm whether these users, by any chance, are using a proxy. I’d check for these and many other connectivity and try and offer solutions