Squid + Dansguardian + freshclam

[Joao Serrachinha <joao.serrachinha@camilopinto.pt>]

I'm using Debian Sid full updated, kernel-2.4.27.
I'm using a transparent proxy on port 3128 and dansguardian in 8080.
Since i install dansguardian, i change my netfilter nat rules to 
redirect http to 8080.
Everything works fine except freshclam. I don't have any log in 
/var/log/dansguardian/access.log related to freshclam, but in 
/var/log/clamav/freshclam.log i'm getting:

ClamAV update process started at Tue Sep 14 15:40:32 2004
main.cvd is up to date (version: 26, sigs: 22925, f-level: 2, builder: 
tomek)
ERROR: Verification: Broken or not a CVD file
Trying again...
ClamAV update process started at Tue Sep 14 15:41:44 2004
main.cvd is up to date (version: 26, sigs: 22925, f-level: 2, builder: 
tomek)
ERROR: Verification: Broken or not a CVD file
Trying again...

I purge the main.cvd and daily.cvd file on the squid box with no results.
So i try to redirect the http to 3128 again. And freshclam works fine.

What's wrong?

thanks.