some time ago I installed SQL server 2016 developer edition on a windows 10 home edition environment (*a laptop to be precise*) and everything was fine.

then someone - an administrator on the box - decided without telling me, to rename said box.

after that when attempting connection to SQL server we have been experiencing the following error messages:

[![enter image description here](https://i.stack.imgur.com/ioVlz.jpg)](https://i.stack.imgur.com/ioVlz.jpg)

[![enter image description here](https://i.stack.imgur.com/LvZss.png)](https://i.stack.imgur.com/LvZss.png)

this is a very similar question to this one: 

[“The certificate chain was issued by an authority that is not trusted” when connecting DB in VM Role from Azure website](https://stackoverflow.com/questions/17615260/the-certificate-chain-was-issued-by-an-authority-that-is-not-trusted-when-conn)

I have been also here:

[The target principal name is incorrect. Cannot generate SSPI context. (Microsoft SQL Server, Error: 0)](https://social.msdn.microsoft.com/Forums/sqlserver/en-US/2d4d6a0f-de2c-4dc3-b813-46167f3ade0c/the-target-principal-name-is-incorrect-cannot-generate-sspi-context-microsoft-sql-server-error?forum=sqlsecurity)

and I have been using the Kerberos Configuration Manager, which gives me a different error message

[![enter image description here](https://i.stack.imgur.com/7TFHv.jpg)](https://i.stack.imgur.com/7TFHv.jpg)

I should say that *I Am able to connect to this instance of SQL server by SQL server authentication* but I want to connect using windows authentication.

just to be clear - this is all a local machine, that does not belong to any domain.

I am not quite sure as how to proceed from here, what I want is to use windows authentication.

The error message related to certificates makes me think about re-issuing certificates here.
I am not sure as for how to get this done, or if this is a valid way to go about this situation.

I will not be around this machine for the day, but I will catch up as soon as possible. I will carry on with my research when time permits.