On my server, I have just enough ports open for the basic service to work right. The server seems to work fine, but every night cpanel emails me it's log watch and I always have several thousand dropped packets. I'd say 95% of these are because 135/445 are closed down. Someone please refresh my memory on their purpose. Aren't they primary used for microsoft services? Being as I run linux, I closed them down. Maybe I should open them back up?
