It is not normal behavior but it is happening consistently. Though yours is the first complaint we have registered in our system about this. It is a bug. We currently don't have it in our road map to put out a new release of the WOL free tool very soon but let me get this in front of our planning team so that it can be considered for a future release.
I apologize for the inconvenience and thank you for letting us know about this.
I'm really hoping you can help me. I've been asked to find out whether Wake On Lan is free for commercial use. I emailed solarwinds customer services who pointed me in the direction of Thwack. I've been unable to find an answer so far.
I would be grateful if you could either let me know whether Wake On Lan is free for commercial use or point me in the right direction of who to ask?