Symptoms

When running a Linux application the following error is thrown:  Error while running daemon: Internal program error: FineNetServerImpl.cpp, 417

Cause

Licensing Service and/or FREngine are using the wrong communication protocol: TCP/IP, LocalInterprocessCommunication, or NamedPipes.

Resolution

Check and change LicensingSettings.xml's ConnectionProtocol property for both LicensingService and FineReader Engine's binaries:

<?xml version="1.0" encoding="utf-8"?>
<LicensingSettings>
    <LocalLicenseServer>
        <ConnectionProtocol ProtocolType="Sockets"/>
    </LocalLicenseServer>
</LicensingSettings>

Note: Default locations of the LicensingSettings.xml:
FineReader Engine's binaries: /opt/ABBYY/FREngine12/Bin/LicensingSettings.xml
LicensingService: /usr/local/lib/ABBYY/SDK/12/Licensing/LicensingSettings.xml