TeamCity Integration: cannot connect

I try to enable TeamCity Integration from youtrack server.

TeamCity Server: http://127.0.0.1:8080

Login and Password are valid and I CAN login manually using browser.

SSL is not used.

When I click the Test connection button I got the following error message:

Error while communicating with TeamCity:Invalid authentication request or authentication scheme is not supported To login manually go to "/login.html" page