Sharp MX-B401 Operation Manual page 705

INSTALLING THE PRINTER DRIVER / PC-FAX DRIVER
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Click the [Custom installation] button.
3
When you are asked how the printer is connected, select [IPP] and
click the [Next] button.
4
If a proxy server is used, specify the proxy server and click the [Next] button.
To specify a proxy server, select [Print via the proxy server] and then enter the
[Address] and [Port number].
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