How to solve the error (default: Error: Connection timeout. Retrying...) when creating a box?

Question

virtual box

I work on Ubuntu I
create a box on this service https://puphpet.com/
I get this error, what's wrong ?
Everything works fine on Windows
default: SSH auth method: private key
default: Error: Connection timeout. Retrying...
default: Error: Connection timeout. Retrying...
default: Error: Connection timeout. Retrying...
default: Error: Connection timeout. Retrying...
default: Error: Connection timeout. Retrying...
default: Error: Connection timeout. Retrying...
default: Error: Connection timeout. Retrying...
default: Error: Connection timeout. Retrying...
default: Error: Connection timeout. Retrying...
default: Error: Connection timeout. Retrying...
default: Error: Connection timeout. Retrying...