Erro conexão com Interbase

Sucesso na conexão!

org.firebirdsql.jdbc.FBSQLException: Resource Exception. Unable to complete network request to host "localhost".
Reason: Unable to complete network request to host "localhost".
	at org.firebirdsql.jdbc.FBDataSource.getConnection(FBDataSource.java:107)
	at org.firebirdsql.jdbc.FBDriver.connect(FBDriver.java:275)
	at java.sql.DriverManager.getConnection(DriverManager.java:512)
	at java.sql.DriverManager.getConnection(DriverManager.java:171)
	at util.Conn.conexao(Conn.java:25)
	at util.Operacoes.consulta(Operacoes.java:26)
	at util.Interface.main(Interface.java:23)
at org.firebirdsql.gds.GDSException: Unable to complete network request to host "localhost".
	at org.firebirdsql.jgds.GDS_Impl.connect(GDS_Impl.java:1602)
	at org.firebirdsql.jgds.GDS_Impl.isc_attach_database(GDS_Impl.java:276)
	at org.firebirdsql.jgds.GDS_Impl.isc_attach_database(GDS_Impl.java:252)
	at org.firebirdsql.jca.FBManagedConnectionFactory.createDbHandle(FBManagedConnectionFactory.java:543)
	at org.firebirdsql.jca.FBManagedConnection.<init>(FBManagedConnection.java:109)
	at org.firebirdsql.jca.FBManagedConnectionFactory.createManagedConnection(FBManagedConnectionFactory.java:374)
	at org.firebirdsql.jca.FBStandAloneConnectionManager.allocateConnection(FBStandAloneConnectionManager.java:61)
	at org.firebirdsql.jdbc.FBDataSource.getConnection(FBDataSource.java:104)
	at org.firebirdsql.jdbc.FBDriver.connect(FBDriver.java:275)
	at java.sql.DriverManager.getConnection(DriverManager.java:512)
	at java.sql.DriverManager.getConnection(DriverManager.java:171)
	at util.Conn.conexao(Conn.java:25)
	at util.Operacoes.consulta(Operacoes.java:26)
	at util.Interface.main(Interface.java:23)
java.lang.NullPointerException
	at util.Operacoes.consulta(Operacoes.java:29)
	at util.Interface.main(Interface.java:23)
Exception in thread "main"

public class Conn {
public Connection conn;
public void conexao() throws InstantiationException, IllegalAccessException{
		try {
			Class.forName("org.firebirdsql.jdbc.FBDriver");
			System.out.println("Sucesso na conexão!");
	conn = DriverManager.getConnection("jdbc:firebirdsql:localhost/3050: D:/JLoja.GDB","SYSDBA","masterkey");
System.out.println("Acessou Banco!");
	//	return conn;	
		
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
	//	return conn = null;
		}
		catch (SQLException e1) {
			
			e1.printStackTrace();
	//	return conn = null;
		}
	}

}