Download nmap (nmap.org/dist/nmap-6.40-setup.exe) and do a ping scan on 192.168.1.* to see if the RPi is even on the address you are trying to ssh into (192.168.1.249). Either that or check in your router to see exactly what IP it assigned to it. It may not be the static IP you mentioned. Mine auto assigned a different IP to the RPi.
says there is an unknown OS on the ip 192.168.1.249, and my gateway is 192.168.1.1
the RPi seems to refuse SSH connection, rather than simply not being found