samba - May 2005 - Winbindd and squid ... help please

Hi

i use WInbind with Squid and SquidGuard ... but it's not stable ... 
squid don't sent all time the Auth at squidguard and i have
a "Access Denied" ... anyone have a answer to this problems ?

I use ntlm_auth ... can i use other software for put the 
authentification and delete squidguard for put
a group based access ? (wb_group ??)

thanks for your help