1. Try these settings. From the home screen of your BB, go to Options - TCP.
Gateway IP: 188.8.131.52
2. Select Save from the menu.
3. Reset your device by pressing the CTRL (Half moon) + CAP + Del keys at the same time
4. Load Regular version of IM+
5. Choose HTTP or TCP modes in IM+ settings. Please also try to change port in settings from 443 to 30000, sometimes it can help to resolve the problem with conneciton.