VNC "Access denied"

Hi guys,

I am having a problem with my VNC, Actually i am using my VNC session for last two month. but now it's show me the "Access denied" when i am trying to access it.
I checked the logs, then i found it has blacklisted by server. error is something like "Connections: rejecting blacklisted connection: 10.10.10.10::4166"

so please help me out.

Thanks