MATLAB: Fread does not work in the UDP connection

freadudp

I have 2 computer connected via an ethernet cable, and I want to set up a UDP connection between them. On the computer associated with IP 192.168.0.1 I have the script
ipA = '192.168.0.1';
portA =9090;
ipB = '192.168.0.3';
portB =9091;
udpA = udp(ipB, portB, 'LocalPort',portA,'LocalHost',ipA)
fopen(udpA)
fwrite(udpA, 1:10)
fclose(udpA)
while on the computer associated with IP '192.168.0.3' I have the script
ipA='192.168.0.1';
portA=9090;
ipB='192.168.0.3';
portB = 9091
udpB = udp(ipA,portA,'LocalPort',portB,'LocalHost',ipB)
fopen(udpB)
a=fread(udpB,10);
fclose(udpB)
I put both script in the editor, ready to be run just playing F5. So I run the latter and the former, but the fread function does not give any results in a, which at the end is empty. Instead, Matlab returns a warning "Warning: Returning data as an array since it is not the same size as requested. You may want to set the DataTermination Mode to 'off'".
However, I tried that, and I also tried not to launch the script but simply commands an the two terminals. But nothing seems to work, and in true I have never been able to set up a UDP connection.
Any ideas? What I am doing wrong?
I'm sorry to ask another question on UDP but really I have read tons of forum and still it isn't working, I am running out of ideas.
EDIT: I want to add that inserting the command line udpA/udpB before the final fclose, I get from udpA
       Read/Write State  
          TransferStatus:     idle
          BytesAvailable:     0
          ValuesReceived:     0
          ValuesSent:         10
but from udpB 
       Read/Write State  
          TransferStatus:     idle
          BytesAvailable:     0
          ValuesReceived:     0
          ValuesSent:         0
Please note the line with no values received.

Best Answer

Disable Windows Firewall. No comment.
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