Why my confluence is down?

[Sławomir Wróbel]

I've just created one and it worked fine.
I clicked "create new space" and the page froze - nothing happened.
So I clicked again and then this popped out:

This site can’t be reached

The webpage at *********************(I starred it) might be temporarily down or it may have moved permanently to a new web address.

ERR_HTTP2_PROTOCOL_ERROR

[Nic Brough -Adaptavist- · Accepted solution]

The server supposed to be serving up the site has stopped or moved.

If this is a Cloud system (domain url ends in .atlassian.net), get in touch with Atlassian support over at https://support.atlassian.com/contact

If it is a server/dc system, you will need to ask your administrators what is happening

[Sławomir Wróbel]

Now the error has changed, it's now:
HTTP ERROR 400