Well, after a little research, found that Veeam monitor is actually using the web port to connect to Virtual Center.
So, the port to use is not 905, is the one used to VMware Web Service port.
For VirtualCenter 1.x, the default port number is 8443 and for Virtual Center. 2.x and ESX Server 3.x, the default port number is 443.
But still, does not work.