Basically, run command prompt as administrator, and run "C:\Program Files\Splunk\bin\splunk.exe clean eventdata clean eventdata -index <index_name> . THis will ask for admin credentials.
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Use a different port for each device. You can use an IP filter in most syslog servers but it means that you have to constantly update this which is a MAJOR hassle. Also read this:
http://www.georgestarcher.com/splunk-success-with-syslog/
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