Updated version form official RH updates (squid-2.3.STABLE4-10.6.2) does
not work with transparent proxy config. Old version does. I've got
random "Permission denied" messages in the browser.
Normal manual config without trasparent proxy rules in ipchains works.
Downgrade to squid-2.3.STABLE1-5 from RH 6.2 solve the problem.
Never mind. This is another local-configuration problem. Sorry.