I can see two instances under SQL Server Network Services in SQL Server config manager

In default instance:

Right clicked TCP/IP--> Properties---> Ip adresses .... I can see port number as 1433

In named Instance:

Right clicked TCP/IP--> Properties---> Ip adresses .... I can NOT see port number as 1433, it is just left blank

Strangely if this is the cause ?

How can i connect to this named instane from one of the production servers management studio 😮