Доброго времени суток!
Ситуация следующая:

gateway:/var/log # uname -a
Linux gateway 2.6.27.7-9-pae #1 SMP 2008-12-04 18:10:04 +0100 i686 i686 i386 GNU/Linux

gateway:/var/log # cat /etc/squid/squid.conf | grep -v '^#' | sed '/^$/d' | more
acl all src all
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 10.0.0.0/8     # RFC1918 possible internal network
acl localnet src 172.16.0.0/12  # RFC1918 possible internal network
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl SSL_ports port 443
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
http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localnet
http_access allow localhost
http_access deny all
icp_access allow localnet
icp_access deny all
http_port 3128 transparent
hierarchy_stoplist cgi-bin ?
access_log /var/log/squid/access.log squid
refresh_pattern ^ftp:         &n... 1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
refresh_pattern .               0       20%     4320
acl shoutcast rep_header X-HTTP09-First-Line ^ICY\s[0-9]
upgrade_http0.9 deny shoutcast
acl apache rep_header Server ^Apache
broken_vary_encoding allow apache
coredump_dir /var/cache/squid

gateway:/var/log # tail /var/log/messages
May 22 12:05:01 gateway squid[26186]: clientTryParseRequest: FD 55 (192.168.1.18:2140) Invalid Request
May 22 12:05:02 gateway squid[26186]: clientTryParseRequest: FD 55 (192.168.1.18:2142) Invalid Request
May 22 12:05:03 gateway squid[26186]: clientTryParseRequest: FD 55 (192.168.1.18:2144) Invalid Request
May 22 12:05:03 gateway squid[26186]: parseHttpRequest: Unsupported method ''
May 22 12:05:03 gateway squid[26186]: clientTryParseRequest: FD 55 (192.168.1.18:2146) Invalid Request
May 22 12:05:04 gateway squid[26186]: parseHttpRequest: Unsupported method ''
May 22 12:05:04 gateway squid[26186]: clientTryParseRequest: FD 55 (192.168.1.18:2148) Invalid Request
May 22 12:05:04 gateway squid[26186]: parseHttpRequest: Unsupported method ''
May 22 12:05:04 gateway squid[26186]: clientTryParseRequest: FD 55 (192.168.1.18:2152) Invalid Request
May 22 12:05:06 gateway squid[26186]: clientTryParseRequest: FD 55 (192.168.1.18:2154) Invalid Request

gateway:/var/log/squid # tail cache.log
2009/05/22 12:17:41| clientTryParseRequest: FD 37 (192.168.1.18:4121) Invalid Request
2009/05/22 12:17:46| parseHttpRequest: Unsupported method ''
2009/05/22 12:17:46| clientTryParseRequest: FD 46 (192.168.1.18:4123) Invalid Request
2009/05/22 12:17:52| parseHttpRequest: Unsupported method ''
2009/05/22 12:17:52| clientTryParseRequest: FD 38 (192.168.1.18:4125) Invalid Request
2009/05/22 12:17:57| clientTryParseRequest: FD 29 (192.168.1.18:4127) Invalid Request
2009/05/22 12:18:02| clientTryParseRequest: FD 18 (192.168.1.18:4129) Invalid Request
2009/05/22 12:18:07| parseHttpRequest: Unsupported method ''
2009/05/22 12:18:07| clientTryParseRequest: FD 42 (192.168.1.18:4131) Invalid Request
2009/05/22 12:18:12| clientTryParseRequest: FD 42 (192.168.1.18:4133) Invalid Request

gateway:/var/log/squid # squid -v
Squid Cache: Version 2.7.STABLE5
configure options:  '--prefix=/usr' '--sysconfdir=/etc/squid' '--bindir=/usr/sbin' '--sbindir=/usr/sbin' '--localstatedir=/var' '--libexecdir=/usr/sbin' '--datadir=/usr/share/squid' '--mandir=/usr/share/man' '--with-dl' '--with-maxfd=4096' '--with-valgrind-debug' '--enable-snmp' '--enable-carp' '--enable-auth=basic digest negotiate ntlm' '--enable-basic-auth-helpers=LDAP MSNT NCSA PAM SMB YP getpwnam multi-domain-NTLM' '--enable-ntlm-auth-helpers=SMB fakeauth no_check' '--enable-digest-auth-helpers=ldap password' '--enable-external-acl-helpers=ip_user ldap_group session unix_group wbinfo_group' '--enable-ntlm-fail-open' '--enable-arp-acl' '--enable-htcp' '--enable-underscores' '--enable-stacktraces' '--enable-delay-pools' '--enable-useragent-log' '--enable-referer-log' '--enable-forward-log' '--enable-multicast-miss' '--enable-ssl' '--enable-cache-digests' '--enable-auth-on-acceleration' '--enable-storeio=aufs,coss,diskd,null,ufs' '--enable-linux-netfilter' '--enable-removal-policies=heap,lru' '--enable-icmp' '--with-samba-sources=/usr/include/samba' '--enable-large-cache-files' '--enable-x-accelerator-vary' '--enable-follow-x-forwarded-for' 'CFLAGS=-march=i586 -mtune=i686 -fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -fPIE -DLDAP_DEPRECATED -fno-strict-aliasing' 'LDFLAGS=-pie'

В чем может быть проблема? Куда копать? Лог файл заполняется примерно за 3-4 часа ...