I accidentally close the ticket support and could not enter my answer.
Here it is:
Previously I could access www.toodledo.com by Safari but could not from within Toodledo application, could not login and sync.
But now it's working well and my account is in sync.
A couple hours ago I bought Toodledo - To Do List 2.1.6 from iTunes, but until now I can not login, sync, or go to toodledo.com from within the application. Always get error message stating: Network Unavailable. You are not currently connected to the internet.
But my connection is fine, browsing and email apps are working just fine.