How can I register my WP device in dev account?

I have trouble with registration WP8.1 device to developer account. My account is active. Device early was active, but I reset phone (Nokia 620) and after that Developer tools don't active this phone. In list (in dev acc) this phone was remove. enter image description here

after I press "register" show this window:

enter image description here

and that's all. Second window close after few seconds and register process don't finish. Please help :)

Solution

Make sure your computer have internet connection. I had similar issue when network proxy was configured incorrectly .

Also try after clearing internet explorer cached content (history,password,cookies etc.)