Following instructions I've found on this forum, I did the screen thing and ran

service fop2 stop
cd /usr/local/fop2
screen
./fop2_server -X 511 -i venet0    <--- Notice custom interface
ctrl-a d

Everything works.

root@asdf:/etc/asterisk $ pgrep fop2_server
1578
root@asdf::/etc/asterisk $ netstat -lnp | grep 444
tcp        0      0 0.0.0.0:4445                0.0.0.0:*                   LISTEN      1578/./fop2_server

When I try to run as a daemon it doesn't.

I took your suggestion from another forum and my /etc/sysconfig/fop2 looks like:

OPTIONS="-d -i venet0"

And it doesn't start up. Where do I go from here?

Note: I disabled FOP (1) from amportal.conf etc.

Figured out my issue... I wasn't being patient enough after calling the service start before checking to see if port 4445 was bound yet.

root@host:/etc/rc.d/init.d $ netstat -lnp | grep 444
root@host:/etc/rc.d/init.d $ service fop2 start
Starting Flash Operator Panel 2: daemon /usr/local/fop2/fop2_server -d -i venet0    <--- added this echo for debug
                                                           [  OK  ]
root@host:/etc/rc.d/init.d $ netstat -lnp | grep 444   <--- ~500ms between each
root@host:/etc/rc.d/init.d $ netstat -lnp | grep 444
root@host:/etc/rc.d/init.d $ netstat -lnp | grep 444
root@host:/etc/rc.d/init.d $ netstat -lnp | grep 444
root@host:/etc/rc.d/init.d $ netstat -lnp | grep 444
root@host:/etc/rc.d/init.d $ netstat -lnp | grep 444
root@host:/etc/rc.d/init.d $ netstat -lnp | grep 444
root@host:/etc/rc.d/init.d $ netstat -lnp | grep 444
root@host:/etc/rc.d/init.d $ netstat -lnp | grep 444
root@host:/etc/rc.d/init.d $ netstat -lnp | grep 444
tcp        0      0 0.0.0.0:4445                0.0.0.0:*                   LISTEN      13623/fop2_server

For reference, I'm using the latest as of 12/22/2012. I believe it's 2.26
The distro is centos. It's a PIAF purple install.