[squid-users] Client can't connect but No log

 Hi all !
 Thanks help me about 'Sement fault'
 Then I reconfigure squid below
 ./configure --prefix=/usr/local/squid --sysconfdir=/usr/local/squid/etc --enable-default-language=Korean
 make
 make install

 and squid.conf is below.
-- squid.conf --
http_port 3128
cache_mem 62 MB
cache_dir ufs /usr/local/squid/var/cache 100 16 256
cache_access_log /usr/local/squid/var/logs/access.log
cache_log /usr/local/squid/var/logs/cache.log
pid_filename /usr/local/squid/var/logs/squid.pid
dns_retransmit_interval 5 seconds
dns_timeout 1 minutes
negative_ttl 30 second
negative_dns_ttl 1 minute
read_timeout 3 minutes
########## user define acl
acl mynet1 src 192.168.1.0/24
acl mynet2 src 192.168.3.0/24
acl home dstdomain "/usr/local/squid/etc/nocache.dst"
acl client src "/usr/local/squid/etc/client.ip"
no_cache deny home
#########################
http_access all client
cache_effective_user squid
cache_effective_group squidadm
memory_pools off
------------------------------------------------

It's all right last 3 days.
 
 This morning sub office user call me and sad "I can't internet!"
 I checked client
 1. Ping is O.K to server from clinet.
 2. In origin setting can internet.
 3. telnet is O.K to server
 4. Error mesasge is not squid error message. It's normal internet error message "Dns not found"
 5. No error in cache.log and access.log
 6. Not all sub office user, random sub user frequently this error
 
 Main office and sub office connected router via leased line.
 and main office and ISP connected fiber cable via VPN.

 subclient ----router--router--switch - vpn--ISP
                                           |
                                       mainclinet(include squid server)

Server SPEC
667Mhz single , 128+256 ECC Reg Memory , 9 + 36G 10000RPM Ultra3 SCSI HDD , 1 NIC
O/S
Redhat 7.3 Default Install setting(Don't kernel compile)
Received on Sun Jul 11 2004 - 18:37:05 MDT