I've solved the issue via adding ip=192.168.1.1 to twonkymedia.ini.
In this way it's restricted to LAN interface. I don't know if it's any issue, probably not.
Please correct me if I'm wrong.
I'll skip checking this issue further in upnp as I'm not familiar enough with it.
Btw. twonkymedia version is 6.0.37.