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First of all, I don't care about DDoS protection because as far as I know it costs hundreds of dollars. I'm just having trouble with my Minecraft server not being properly queried at Minecraft Forums' server list. Check it out:
I filed a support ticket at Minecraft Forums and the guy asked if my provider had DDoS protection, because that could be the cause. So, do I get DDoS protection with the $60 VPS plan? (dual core, 3 gigs RAM, 10GB SSD)
We have some protection for our customers but it is done on a rule by rule basis for the most part so nothing that would cause this.
Looking at that posting more in-depth it seems that there service simple can't query your server. This most likely means you have entered some incorrect information when adding it or you are running a firewall/real time anti-virus which is blocking the connection.
You may also want to make sure you have enable-query=true in your server.properties.
@Kraze^NFo> Juski has a very valid point
@Juski> Got my new signature, thanks!
@Kraze^NFo> Out of context!
@Juski> Doesn't matter!
@Juski> You said I had a valid point! You can't take it back now! It's out there!