I have read countless articles on the internet about fixing this error, but nothing works. Sorry, if there is an easy answer, but I can't figure it out.Installed from CD SQL Server 2014 Dev Ed on my laptop. Setup as named instance with mixed mode authentication.When trying to connect to server in SSMS 2014 using Windows Authentication or SQL Server Authentication, I get this error. (Login failed for suer 'xx' (Microsoft SQL Server, Error: 18456)The server name is listed in the drop down, so that should be correct.The name listed for Windows Authentication is the name I selected as Administrator when installing SQL Server.Network Configuration Protocols: Shared Memory(1), TCP/IP(2), Named Pipes(3) - All Enabled. It doesn't seem to matter which are enabled/disabled or in what order. All combinations result in the same error.The user I selected as Administrator in the installation is a domain user, so it appears as <domain>\<user>. Is a domain user prevented from using the Developer Edition? If so, how would you switch to a local Administrator to use with Windows Authentication. The User name is greyed out.I tried installing SQL 2014 Dev Ed CD on 3 different machines. It works on a laptop that is a member of WORKGROUP, but failed on two machines that were members of the same domain . That is a commonality, but is that the issue? I would think you could connect with the "sa" account. That gives the same error. You can type in the password correctly or just make something up. Both give the same error.Really stumped here.ThxCSC
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