Do not use Upnp if you know how to port forward. If possible get rid of ISP provided hardware because its garbage. If you dont want to change isp provided hardware configure your wlan card MAC as static so your IP is always the same, disable upnp, port forward two slsk ports (first one that is specified and second one obfuscated, its right below the first). Still i highly suggest getting rid of ISP hardware, its locked down garbage.