[squid-users] Connection Timed Out While Squid Running Well

Hello,
I'm a newbie in linux and squid things
On my college we have primary proxy which connected to internet, and i use
those primary proxy as my cache parent. My system running Debian with
kernel 2.6.6 and squid 2.4 STABLE 6.I've just upgrading it from the STABLE
4 version. After that i get this problem :
my squid is running well, my primary proxy is running well when i'm
testing it via browser but when i set up my browser to use my own squid as
proxy i can't connect to the internet.

this is my setting for cache peer
cache_peer 202.xxx.xxx.xxx parent 8080 3130 login=xxx:xxx default

after checking the cache log i found my squid assumed that the digest from
cache parent temporarily disabled and the cache parent is dead.(the fact
the cache parent is running well)
from the access.log it has an action code 504 (Gateway Time Out) ???

Well,anyone can help ? Thanks ...
HP

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** Architecture And Network Laboratory **