There are some sporadic reports of this situation. We believe it to be an issue with proxys that require authentication. We are still investigating.
Then of course local PC firewalls will often pop-up an information box when a new program attempts to access Internet.
Peter, if you exit AxCrypt after an unsuccessful attempt, and then with Windows Explorer go to %localappdata%\axcrypt and e-mail me the file SnapshotReport.txt to svante dot seleborg at axcrypt dot net I’d appreciate it.
You can also open it in Notepad, and you’ll probably get an idea of what the problem is from the more extended error information there.