Outlook Won’t Connect

Good day,

I am having issues with a users Outlook not responding. I have completed at least 10 more before this one and all have been done the same. I have the correct address for the exchange server. I am connected to the domain through our VPN client so I am not sure why Outlook cannot connect. I can ping and connect via remote desktop to the exchange server.

Does anyone have any clue why this won’t connect?

Thanks!

Cheers