How many RJ45 ports does your wifi router have?  Are you connecting more than one item to a cable modem?  Cable modems (sometimes) come with a USB port and an RJ45 port.  This does not mean you can use both.  It's one or the other.  If your home has a single computer to the cable modem then that's all the cable modem is going to accept.  If one wants more than one computer to the cable modem one plugs the upstream port of a router to the cable modem and then has the multiple downstream port switches (RJ45 ports) and possibly wireless.  When you boot a computer with DHCP to the cable modem it will not be assigned an IP address in the 192.168.xxx.xxx range but if you plug into the router, you will.  If you connect wirelessly to the router you will also get assigned via DHCP an address in the 192.168.xxx.xxx range.  Your computer shows an IP address of 192.168.43.51 I believe with a gateway of 192.168.43.1.  The .43 is unusual.  Still, if the wifi router is assigning addresses in the 192.168.43.0 net then you should be able to plug your computer cat5 RJ45 cable into the back of the wifi router and boot and still get assigned a 192.168.43.0 net address.   There should be more than one RJ45 downlink port on the wifi router.  Plug both the computer and the Jupiter into different RJ45 ports on the wifi router.  Boot the computer, boot the Jupiter, open a browser on the computer and go to http://192.168.43.1, log into your wifi router, go to status, go to local network, bring up the DHCP client table, see what DHCP addresses have been assigned, and there should be two, the one assigned to your computer and one assigned to the Jupiter.  Open putty on the computer, input the address assigned to the Jupiter, open, sign into the Jupiter.  You're home free.