If you cannot start EPSON Scan for scanning over a network, try these solutions:
Windows: 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.