Hi I'm new to all this network stuff so please bare with me. I went and got myself a Toshiba SG20 the IP address is 192.168.1.168 subnet 255.255.255.255 . Now my problem is I can't communicate with the darn thing as I can't set my desktop PCs subnet mask to match the Toshiba. I get an error saying The Combination of IP address and Subnet mask is invalid. All of the bits in the host address portion of the IP address are set to 1. Please enter a valid combination of IP address and subnet mask. My question is what would be a valid IP address on a subnet mask of 255.255.255.255, I only want to get in so I can change the subnet mask to 255.255.255.0 to match the rest of my network. Please help as it's doing my head in.