Please, post your logs. Did you get "server error wrong login/password" message?
Maybe you tried to use new solutions - operations with phones for which you need to authorize on the server & have an account with credits on it.
Starting from version 37, Samsung tool can repair IMEI and make some other operations through the server. So, you require the account with credits on it. The number of credits on the account does not matter for repair IMEI because it's free - credits will not be charged.
Without this, you won't be able to use these new solutions.