Hello guys, I'm with the same issue that I had some moth ago sometimes my squid can't authenticate. follows the log from cache. log 2012/05/29 10:41:44| WARNING: up to 20 pending requests queued 2012/05/29 10:41:44| Consider increasing the number of ntlmauthenticator processes to at least 40 in your config file I wonder if I need grow my parameter "auth_param ntlm children". about 5 moth ago I've grown it from 5 to 20 because the same problem. until now has been resolved. but the problem seems come back so I wonder if there is other thing that might to be the cause ?!?! follow my parameter in the squid.conf auth_param ntlm program /usr/bin/ntlm_auth becomex/srv-ad1 --helper-protocol=squid-2.5-ntlmssp auth_param ntlm children 20 auth_param basic program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-basic auth_param basic children 20 auth_param basic realm Controle de acesso a Internet auth_param basic credentialsttl 2 hours there might are others things beyond these parameter "ntlm children" ? thanks