Install Change Auditor Coordinator

Hello

I am trying to install the Coordinator and irun into an error in the first wizard.

when i need to give him info about SQL - he tells me : " the database server could not be located"

I am sure that the SQL PORT is open and working (tried TELNET)

I created a new instance for this server and surely use a user that is the owner of this instance

still nothing

Please Help - Thanks in advance