On a side note, I have a wifi antenna installed on my S3+, but I can't access the web interface unless I plug an ethernet in and access that IP instead. Same can be said for using my SSH and SCP utilites. However, when using the wifi, the unit still hashes fine and all that. What gives?
I had similar results and although it was mining, I was never able to access my S3+ web interface via WiFi. After many hours of research and trying I finally decided to use a router as a wireless switch. It required another piece of hardware but accomplished the desired result while maintaining access via the web interface and ssh.
-fvineyard