ithelp 757 Posting Virtuoso Banned

Hi,
When I use office network SNMP queries from my PC to device are succesful, but when I create a local network, using a hub, connect pc and device to it and try quering SNMP objects, it times out
Can anyone tell me what could be the problem in local network so that SNMP query times out, I have the firewall diabled in local network as well.