Hey and thanks for the fast reply.
the ISP is a local one here in sweden called Insatnet.se, the modem is a Cisco EPC3212 which is standalone.
I contacted my ISP and they said that there was no block from their side and that the modem itself does not contain a firewall.
On the router the firmware is 1.21EU
this is in the advanced -> port forwarding at the router setup screen.

192.168.0.199 being my local ip and i'm trying to host this server from this computer.
hope this is of any help.
Oh and also, i made my local ip static, since i read that the router tends to give new ones every 24 hours.
thanks!