Unhappy [Q] about fail network connections cm7 rom in my s5570i

hi good day..can anyone help me how to work internet connection in cyanogenmod rom? i am using roms,stock based rom,cm7 before, i haven't encountered problems.. but now i didn't connect in internet using cm7 roms.. but in stock based custom roms network connection works..
what would be the problem?? i hope you can help me..
sorry for my bad english.