Cannot link Dropbox Mac desktop app with my account - ERR_ADDRESS_UNREACHABLE

Hi,

I have installed the Dropbox app on a new Mac mini. Previously I had it on my Macbook.

However, everytime I try to link the app to my account, so it syncs automatically, I get the ERR_ADDRESS_UNREACHABLE error.

Here are the steps I take to get the error

1. Click on the Dropbox icon in the top bar
2. Click the settings wheel
3. Click 'sign in'
4. New window appears
5. Click 'Open sign in' 
6. Browser opens new page: API request authorization
7. Now it reads
   1. Dropbox would like to:
   2. Connect with your Dropbox account.
   3. Cancel/Allow
8. I click 'allow'
9. Then I see a new page with the error
   • This site can’t be reached
   • https://dropbox.com/desktop/oauth2?code=.... is unreachable
   • ERR_ADDRESS_UNREACHABLE

I have tried

• Restarting the Mac multiple times
• Connected to my phone to test if the connection is the problem
• Uninstalled, restarted and newly installed the app
• Tried Chrome and Safari
• Tried googling the problem
• Unlinked every app and device linked to my account
• Sign out of my account

The problem persists.

I do not know what else to do. Can anybody help?