Error connecting to server when decrypting/opening vault?

Hi, today I encountered an error while trying to open my file vault. Cryptomator says there’s an error while connecting to the server “cryptomator-vault”. No additional user could login to the file server?

The vault is stored in my Dropbox, and it worked fine 'til today.

It’s the first time this error occurs. MacOS is High Sierra, 10.13.4, Cryptomator is 1.3.2

I will just reply to myself, as I just resolved the problem.
The error was due to a misconfiguration of the hosts file. Resetting hosts to the standard config resolved the issue.