Linking SQL servers error
Your error here is 


  server not found


This is because you used @srvproduct=N'SQL Server', in this case you should use SQL Server's pc name in case of default instance, i.e. this connection string would be correct in case of default instance:

EXEC master.dbo.sp_addlinkedserver @server = N'my_pc_name', @srvproduct=N'SQL Server'


or use this one in case of named instance:

EXEC master.dbo.sp_addlinkedserver @server = N'my_pc_name\inst_name', @srvproduct=N'SQL Server'


If you want to use any other name, even just IP (or IP,port in case of named instance, use @provider=N'SQLNCLI':

for default instance 

EXEC master.dbo.sp_addlinkedserver @server = N'my_linked_server_name_as_I_want_it', @srvproduct=N'', @provider=N'SQLNCLI', @datasrc=N'10.237.69.11'


for named instance:

EXEC master.dbo.sp_addlinkedserver @server = N'my_linked_server_name_as_I_want_it', @srvproduct=N'', @provider=N'SQLNCLI', @datasrc=N'10.237.69.11,your_port'


If you want to use GUI (SSMS), or change server name to your pc name, or use another radio button position, for ex. SQL Native Client (other than SQL Server)