Epson PowerLite 1715c - Manual (Page 80)

80 Presenting Through a Wireless Network
3. Select the Encrypt communications checkbox.
4. Click OK .
Enabling Network Security Options
You need to enable network security including WEP, WPA, EAP,
LEAP, or PEAP, or firewall settings on your network and on the
projector (see page 67). For network setting details, follow the
directions from your network administrator.
If using EAP, you need to make settings at the projector that match
the authentication server settings. Check with your network
administrator for details on RADIUS settings.