From our office, we can't reach our website anymore.

But from home (or other ISP network, ever from cellphone), it is reachable! 
I performed a traceroute from office and the data stop at `116.251.117.165` IP address.

[![tracert info](https://i.stack.imgur.com/CghL7.jpg)](https://i.stack.imgur.com/CghL7.jpg)

The same traceroute from home runs fine and reach the endpoint (so the website is working from home).

So, what is the problem and how to solve it?