[squid-users] QUID stops responding intermittently.

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Hi all,

I have installed Squid 3.0 STABLE on RHEL5. I am using it on conjunction
with Shorewall 4.4.2.2. I've tested that Shorewall is working fine on
machine. The problem is that SQUID stops responding intermittently. This
period ranges from minuts / hours / days. Some time it works absolutely
fine and at other times it just dies. Even "tail -f access.log" does not
show any activity at all. Internet stops working.

Machine is Pentium D 2.0 GHz with 2 GB of RAM. Out of my squid.conf
through *grep -v "^#" /etc/squid/squid.conf | sed -e '/^$/d'* is

acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8
acl localnet src 192.168.4.0/24 # RFC1918 possible internal network
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl CONNECT method CONNECT
acl BusinessHours time M T W H F 9:00-13:00
acl BusinessHours time M T W H F 14:30-19:00
acl BadSites dstdomain "/etc/squid/restricted_sites.list"
http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny BadSites BusinessHours
http_access allow localnet
http_access deny all
icp_access allow localnet
icp_access deny all
htcp_access allow localnet
htcp_access deny all
reply_body_max_size 5 MB
http_port 46095 transparent
include /etc/squid/mediatypes.list
hierarchy_stoplist cgi-bin ?
cache_mem 256 MB
cache_dir ufs /var/spool/squid 16384 16 256
access_log /var/log/squid/access.log squid
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern (cgi-bin|\?) 0 0% 0
refresh_pattern . 0 20% 4320
shutdown_lifetime 5 seconds
visible_hostname gateway.folio3.com
icp_port 3130
coredump_dir /var/spool/squid

Any help on where to look for the error and any remedy would be appriciated.

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Regards,
Asim Ahmed Khan
Email: aahmed_at_folio3.com