I'm aware of hold old this post is, but considering there was no information listed, I figured I could at least put my knowledge of SNES emulators and netplay in case anyone else comes here needing to know how to get it to work.
I have gotten consistent success regarding using ZSnes for netplay. However, it can't be the most recent edition of ZSnes. Only version 1.42 will work properly, more or less. Sometimes it takes a little fiddling to get it to work correctly. If anyone wants, I can write out a full guide detailing how to use ZSnes in conjunction with another program like Tunngle or Hamachi to get a more stable and efficient connection. This lets you use the UDP instead of TCP option, which gives a faster, more stable connection, making faster paced games such as Kirby Super Star or Street Fighter 2 more precise and less laggy. I'll probably write out a full guide anyway when I get home from work because I have nothing better to do.