trying to find root cause of minidlna error messages in logs

I keep seeing the following error messages in my syslog but cannot find any reference as to where/why they are originating. Im running TomatoRAF 1.28.9013. The messages keep appearing every 10 minutes or so.

Can anybody provide some insight or direction to find out more or debug the issue? Nothing useful on google...

Oct 12 10:26:13 tomato daemon.warn minidlna[20722]: SoapMethod: Unknown: GetExternalIPAddress
Oct 12 10:26:13 tomato daemon.warn minidlna[20722]: Returning UPnPError 401:...

trying to find root cause of minidlna error messages in logs