root doesn't have permission to edit file? tcp_fin_timeout

Hi, I'm running FC4. I've been trying to tweak some network
settings, specifically the tcp_fin_timeout value

problem is, when I run this (as root)

echo 30 >/proc/sys/net/ipv4/tcp_fin_timeout

I get

bash: /proc/sys/net/ipv4/tcp_fin_timeout: Operation not permitted

I can't figure out why root isn't able to do this. I can on my other
FC4 box no problem, and this seems to be the normal way to set this
value, according to folks in this group & others.

any help?

.

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