What you see in that image is the last time SmartThings was able to ping the hub from their end, not you from the IDE. Here’s mine just a couple minutes ago:
The issue with being Inactive could be a few things.
If your hub recently got a firmware upgrade, it could have not gone well, and/or it requires a power cycle. That happened to several people not too long ago. You could check your hub’s event log to see if an update was pushed, or email email@example.com
You could be having a power issue at your vacation home with either the circuit the hub is plugged in to, or something more significant.
You could be having Internet issues at hour vacation home. I was in that same situation earlier this week when CenturyLink had an outage in my area for 2 days.
I’d first try to diagnose Internet issues:
Can you check with your provider to see if they’re having any problems? If not, ask them if they can see your modem/router active.
Can you ping your home’s router?
Do you have any other network connected devices you can try to reach, like cameras in your vacation home?