hi
no
assuming what you have is just a modem, then perhaps talk to your isp and see if they can help.

I have a separate modem and a router..

Just to give an update, I changed my Nat settings in voobly to override default proxy server, and it's fixed now. It takes maybe 5-7 seconds to connect but it does.

Na, it was just temporary.

hi give all the details you can find on the modem.
did you talk to your isp?

I had a talk with them today, they said no port is closed. I tried googling the details but there seems to be no info about the modem.