Those error messages are saying Splunk does not have permission to use port 514. All ports <1024 are "privileged" and require special permission to access. Running Splunk as root will solve that, but I highly discourage that. The recommended practice is to send syslog data to a dedicated syslog receiver (syslog-ng, for example), have it write the data to disk, and have a UF monitor those disk files. You also can use Splunk Connect 4 Syslog (SC4S) to send the data directly to Splunk.
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