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Cloud security groups not working with CentOS

I've created a CentOS Virtual Host and I've opened the port 5050 in my security groups, however I can't access that port in my Virtual Host.

I've tested the same thing with Ubuntu and there was no problem with it.

It is very easy to reproduce.

  1. You create a new security group and you add a rule to open port 5050 from
  2. Deploy a new CentOS instance. When it is up you can run a netcat process listening in that port.

nc -l 5050

  1. From any remote host, you try to telnet that host

telnet $MYHOSTIP 5050

It wont work. However if you do the same steps using Ubuntu instead of CentOS it will work without any problem

Any help would be appreciated.