[CentOS] Problem with intercept squid and boinc

Hi,
I have configured a squid httpd proxy cache in intercept/transparent mode.

The problem I have is that the boinc client from setiathome have problem
connecting to its server.
If I disable squid interception, all works fine.

I see in the access_log from squid that the last request its a POST

Anyone have seen this problem? How can I debug it.

Thanks
Oliver

-- 
Oliver Schulze L.
<oliver at samera.com.py>