Not able to connect to TCP Server running on same PC using Matlab tcp client

Hi,
I have created a tcp server using C and running on my local PC (localhost) , listening to clients at port 5566. I could connect if i create a c program for tcp client to connect to the tcpserver on localhost.
When I'm trying to connect to this server from Matlab, running on the same PC I get the below errors.
Below are the comments given,
>> t = tcpip('localhost', 5566, 'NetworkRole','client');
>> fopen(t);
Error using icinterface/fopen (line 83)
Unsuccessful open: Connection refused: connect