A connection was successfully established with the server, but then an error occurred during the login process. (Error Number: 233)

Question

I am having error while connecting to SQL Server:

Details in Stack Trace are:

===================================

Cannot connect to ServerN         


        

Answer 1

I got that error message in code line containing SqlConnection.Open() running my .NET code as x64 application. Running as x86 causing no errors.

Solution was to deactivate the Force protocol encryption option for TCP/IP in %windir%\System32\cliconfg.exe

Force protocol encryption