I experience the same problem. "<< msg_auth.rsa .." and ">> msg_error, 5" in log file. In uninstall program I am checking "revove all my personal settings" or something like this. Are uninstall not deleting all my personal data? Should I remove manually? Strange. By the way, I have scanned registry and deleted everything what contains :logmein" or "hamachi" when hamachi was uninstalled - there left (i do not know why) network adapter service and hamachi-2 service... But no avail. After installing again a have got same error. Please, give me a hint, what should I delete to do not get this eror and my hamachi will finaly connect to server.