Get List of Linked Servers and associated logins

Add link server

EXEC sp_addlinkedserver
   @server=N'LINK_SERVER_NAME', 
   @srvproduct=N'',
   @provider=N'SQLNCLI', 
   @datasrc=N'REMOTE_SERVER_CONECTION_STRING';

EXEC sp_addlinkedsrvlogin 'LINK_SERVER_NAME', 'false', NULL, 'REMOTE_USER_LOGIN', 'REMOTE_USER_PASSWORD';

Remove link server


EXEC sp_dropserver 'LINK_SERVER_NAME' [,'droplogins']

Reports information about a particular remote or replication server, or about all servers of both types. Provides the server name, the network name of the server, the replication status of the server, the identification number of the server, and the collation name.


EXEC sp_helpserver

This script will get the list of Linked server with its properties and its associated local/Remote login list.


SELECT
          ss.server_id
        , ss.name
        , ss.data_source
        ,'Server ' =
          Case ss.Server_id
                    when 0
                              then 'Current Server'
                              else 'Remote Server'
          end
        , ss.product
        , ss.provider
        , ss.catalog
        ,'Local Login ' =
          case sl.uses_self_credential
                    when 1
                              then 'Uses Self Credentials'
                              else ssp.name
          end
        ,'Remote Login Name' = sl.remote_name
        ,'RPC Out Enabled'   =
          case ss.is_rpc_out_enabled
                    when 1
                              then 'True'
                              else 'False'
          end
        ,'Data Access Enabled' =
          case ss.is_data_access_enabled
                    when 1
                              then 'True'
                              else 'False'
          end
        , ss.modify_date
FROM
          sys.Servers ss
          LEFT JOIN
                    sys.linked_logins sl
                    ON ss.server_id = sl.server_id
          LEFT JOIN
                    sys.server_principals ssp
                    ON ssp.principal_id = sl.local_principal_id