If you installed a third-party firewall on your Mac, it could be the cause of scan communication issues. The firewall that comes with macOS and OS X does not impact scan communications.
Confirm the following port information is correct in your third-party firewall. For steps to check ports, consult the support documentation for your particular firewall software.
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SOAP-based scan: port TCP (8289, 8989)
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LEDM-based scan: port TCP 8080
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ORBLite-based scan: port TCP 9500
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HDT-based scan: ports TCP (9290, 8290) and for PML/SNMP TCP (161, 162) AirScan (uscan) - port TCP 8080 Secure AirScan (uscans) - port TCP 443 IPP (AirScan Scanner uses IPP as well) - port TCP 631
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Bonjour Discovery: ports UDP (5350, 5351, 5353)
Try to scan. If the error persists, continue to the next step.