Epson C823781 - Net Print Server Administrator's Manual page 198

The following screen appears.
4. The address you set here becomes the port for Internet
printing. Make the settings described below.
Enter Printer URI:
Enter the target printer's URI up to 49 characters. The URI you
set here must be same as the IPP URL you have set for the IPP
setting screen in EpsonNet WinAssist/WebAssist. Do not use
the following characters; | \ [ ] { } < > # " `
Format: http://IP address of printer:631/printer name
Example: http://192.168.100.201:631/EPSON_IPP_Printer
Use Proxy:
When using the proxy server, select this box and enter the
Proxy Server Name and Port Number. All communication is
done via the proxy server.
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EpsonNet Internet Print