My squid.conf

snmp_port 3401
forward_snmpd_port 0
snmp_access allow my_lan localhost
snmp_access deny all
snmp_incoming_address 0.0.0.0
snmp_outgoing_address 0.0.0.0

Error Messages.
2003/12/15 15:11:30| Accepting SNMP messages on port 3401, FD 44.
2003/12/15 15:11:30| commBind: Cannot bind socket FD 45 to *:3401: (48)
Address
already in use
FATAL: Cannot open Outgoing SNMP Port
Squid Cache (Version 2.5.STABLE4): Terminated abnormally.


Note: I run the follow command line for determining if this port is
ocuped by another process, but nobody used the port.

netstat -a -n | grep -n "udp.*:3401"

empty output

B.