http://www.computing.net/answers/wi... I have got one of my client has got a simple office network with three PCs (2 desktops A and B and one laptop C,,,,,all of them have got Vista Home edition). Those desktop are connected through a modem router. He bought a computer B recently and it has a Trend Micro Internet Security installed on it,,,,,,,a USB printer is connected to this B PC to be shared with A and C. The other two PCs have not got Trend Micro Internet Security (I am aware of security implication , this is not the issue of our thread) the printer is shared but A and C can not ping and can not print. I am sure that the problem lies with the Firewall setting for Trend Micro Internet Security, because when I shut down it from A and C I can ping the B and I can print ,,,,while when Trend Micro Internet Security is running I can not ping B and I can not print. I tried to search how to configure firewall to enable printer sharing I could not find that http://www.vistax64.com/network-sha... >>>>If using Norton, McAfee, Trend Micro I.S., make sure file and printer sharing is enabled in THEIR firewall (or LAN allowed, depending on how their Exceptions are worded in their Firewall)<<<< I tired google without any success. http://www.google.com.au/search?cli... http://www.microsoft.com/windowsmob... Any idea how to configure the firewall to enable a printer sharing ? Thanks