[kazekene]

Try Updating the Server to 0.3e and make sure you all have 0.3e Client
Oh, and also make sure if he actually did port forwarded it and he's not only locally hosting it

http://files.sa-mp.com/sa-mp-0.3e-install.exe <----- For The 0.3e Client
http://files.sa-mp.com/samp03e_svr_win32.zip <----- For the 0.3e Server