what are the other options, if I want to open a port and don't want (or can't) to go to the router config ?
If you have the ability to disable UPnP on the router, then you presumably have the ability to set up port forwards manually. "Don't want" doesn't come into play; if you disable UPnP, that's the trade off you're making.
alt Hacker News
If you have the ability to disable UPnP on the router, then you presumably have the ability to set up port forwards manually. "Don't want" doesn't come into play; if you disable UPnP, that's the trade off you're making.