im posting this here since i am, in every sense of the word, a newbie.
We have 3 MS failover clusters at work, totaling 12 instances for production and 26 for test and i can connect to the all but one!
i usually work from a terminal server where all our tools are installed, i do have SSMS installed on my local computer though and if i use the local SSMS and the same credentials as i logon to the terminal server with (my admin account) i CAN connect...
i´ve also asked a colleague to try from the terminal server and she can!
so the problem is related to my account on the terminal server only...
the error message follows:
A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: SSL Provider, error: 0 - The certificate chain was issued by an authority that is not trusted.) (Microsoft SQL Server, Error: -2146893019)