The rules you set up on your D-link router is set for a fixed IP adress 192.168.1.2. It could be that your computer that is running DW has received a different IP-adress from your router's DHCP service since then. And possibly assigned the 192.168.1.2 to another computer in your home. This can happen if your computer has been turned off for too long. Especially with WLAN connections, which usually have IP-adress leases valid for between 1 and 8 hours. Within this time the computer must request an extension of the lease. If the lease runs out then it is 'first come, first serve'. To solve that problem you should look into the router options to reserve this 192.168.1.2 address for the specific MAC-address of your computer's network card. Or sometimes it can be assigned to the computername of your computer. This is probably found somewhere in the LAN option in that left-side menu.
As Molonlabe said, you have to make sure this is set up propperly on both your and your friend's side.
If you want to connect to the DW host of your friend, or he wants to connect to your DW host, then you need to provide DW the external adress of the router (irregular w.x.y.z adress assigned by your or his ISP), NOT the internal IP-address like 192.168.1.2. The latter one is only valid inside your LAN at home and not addressable on the internet. Your router should also have a page telling you your WAN IP-address. Tell your friend to provide this IP-adress to DW to connect to you.
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