Wireshark is not showing TCP Packets

Hi,

I'm trying to capture the TCP traffic between 2 devices with wireshark. The 2 devices are connected via Ethernet with a Netgear ProSafe doing mirror of the port I want to view connections.

My computer is Win7 x64 with a Realtek PCIe GBE. I want to see TCP packets with destination Ip of one of the devices.

I have also tried same sniffer situation with a computer with an Intel NIC and I can see all TCP packets ( 1 per second)

for both cases, wireshark was installed for first time.

I read something about chimney and I already disabled via CMD, but continue with same situation.

Any Idea?

Thanks, Guillermo