I had issues connecting to my WIFI and or accessing recalbox webinterface My configuration was like this...... ISP modem (wifi off) > Netgear router (no password / MAC filtering ) > Repeater (WPA password ) I was able to connect to the repeater with my RP3, but I could not remote or access shared folder from my computer ( connected to the same repeater ) I attempted to connect to my Netgear router ( from the recalbox GUI) it did not allowed me to connect ( Wifi configuration error ) I then added password to my Netgear router, and everything works like a charm 
So my new setup is like this........ ISP modem (wifi off) > Netgear router (WPA + MAC filtering ) **TL;DR ** Try adding password to your wifi network or update from WEP or WPA, reboot and try again 
