[SQU] NAT open failed

Hi all,
I got these messages in my cache.log:
2000/12/02 12:45:57| parseHttpRequest: NAT open failed: (13) Permission
denied
2000/12/02 12:45:57| clientReadRequest: FD 94 Invalid Request
2000/12/02 12:46:48| parseHttpRequest: NAT open failed: (13) Permission
denied
2000/12/02 12:46:48| clientReadRequest: FD 24 Invalid Request

Should I worry with these message? How to solve the problem?
FYI I use 2.3S4 as WCCP, FreeBSD 4.0-RELEASE, and I've done the step like
in http://www.squid-cache.org/Doc/FAQ/FAQ-17.html#ss17.10
Please, what am I missing?

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