I was a revenue passenger on an ASA RJ flight a few weeks back from DFW to MEM. I was the last person to board & it was about 15 minutes before departure. As I boarded, I said hi to the FA & asked her if I could say hi to the guys up front. She then took a big step to her right (to block access to the cockpit) and informed me that nobody was allowed up front for security reasons.... what is up with that? Is that a company policy at ASA or just at the flight crews discretion? It's not a problem, I'm just curious.