If you cannot start Epson Scan for scanning over a network, try these solutions:
Windows 8: Navigate to the Start screen and select EPSON Scan Settings. Make sure the Connection setting is set to Network, then click the Test button.
Windows (other versions): Click or Start > All Programs or Programs > EPSON > EPSON Scan > EPSON Scan Settings. Make sure the Connection setting is set to Network, then click the Test button.
Mac OS X: Open the Applications folder, click Epson Software, and click EPSON Scan Settings. Make sure the Connection setting is set to Network, then click the Test button.