Replication configuration issues

Hi Team,

While I try to configure replication getting below error message:

SQL Server replication requires the actual server name to make a connection to the server. Connections through a server alias, IP address, or any other alternate name are not supported. Specify the actual server name, "servername". (Replication.Utilities)

Note: SQL server instance names shows different in sql server configuration manager and SSMS

sql server instance name in  configuration manager: 2di3100\sqlserverprod ,

but i run the query in SSMS SELECT @@SERVERNAME it shows: 2di3100\plugin.

how to fix this issues please help me with steps.