Tekniko, yup I typed the exact url from the preview window, the one with my IP address along with the port number. Yes, I run the preview first before trying to preview on my phone. I tried refreshing on both ends as well, and even go a bit deeper into the game as well with no luck.
lennaert, yup I run C2 as administrator every time.
Ashley, thanks for that. Sorry, I am really bad at networking. I will try searching for information on checking the LAN ports. Will update as soon as I can.
Thank you guys!