Squid - internet nao funciona

Estou com o seguinte problema:

Tenho um servidor Win 2003 com AD e um servidor Proxy com Squid, Winbind, Samba.
Quando os usuarios da rede logam nas máquinas e abrem o browser para acessar a internet aparece a tela de autenticação do Squid, que por sua vez entrega para o AD realizar a autenticação dos usuarios.

De uns dias pra cá não aparece a tela de autenticação para o usuário e com isso o browser nao carrega site nenhum.

Alguem pode me orientar?

manda ai teu squid.conf para analise.
ps: usa um arquivo zip e manda via rapidshare ou outro serviço do tipo.

As vezes que o problema aconteceu do syslog pude observar o seguinte...

Jun 2 13:08:43 localhost (squid): WARNING: because of this '10.16.9.1-10.16.9.20' is ignored to keep splay tree

searching predictable
Jun 2 13:08:43 localhost (squid): WARNING: You should probably remove '10.16.9.1-10.16.9.20' from the ACL named

'lab'
Jun 2 13:08:43 localhost (squid): WARNING: '10.16.9.1-10.16.9.20' is a subnetwork of '10.16.9.1-10.16.9.20'
Jun 2 13:08:43 localhost (squid): WARNING: because of this '10.16.9.1-10.16.9.20' is ignored to keep splay tree

searching predictable
Jun 2 13:08:43 localhost (squid): WARNING: You should probably remove '10.16.9.1-10.16.9.20' from the ACL named

'lab'
Jun 2 13:08:43 localhost (squid): WARNING: '10.16.10.1-10.16.10.20' is a subnetwork of '10.16.10.1-10.16.10.20'
Jun 2 13:08:43 localhost (squid): WARNING: because of this '10.16.10.1-10.16.10.20' is ignored to keep splay tree

searching predictable
Jun 2 13:08:43 localhost (squid): WARNING: You should probably remove '10.16.10.1-10.16.10.20' from the ACL named

'lab'
Jun 2 13:08:43 localhost (squid): WARNING: '10.16.11.1-10.16.11.20' is a subnetwork of '10.16.11.1-10.16.11.20'
Jun 2 13:08:43 localhost (squid): WARNING: because of this '10.16.11.1-10.16.11.20' is ignored to keep splay tree

searching predictable
Jun 2 13:08:43 localhost (squid): WARNING: You should probably remove '10.16.11.1-10.16.11.20' from the ACL named

'lab'
Jun 2 13:08:43 localhost (squid): WARNING: '10.16.11.1-10.16.11.20' is a subnetwork of '10.16.11.1-10.16.11.20'
Jun 2 13:08:43 localhost (squid): WARNING: because of this '10.16.11.1-10.16.11.20' is ignored to keep splay tree

searching predictable
Jun 2 13:08:43 localhost (squid): WARNING: You should probably remove '10.16.11.1-10.16.11.20' from the ACL named

'lab'
Jun 2 13:08:43 localhost (squid): WARNING: action 'lab' (line 590) already has a password
Jun 2 13:09:39 localhost squid[10425]: Squid Parent: child process 10427 exited with status 0
Jun 2 13:09:40 localhost squid[10488]: Squid Parent: child process 10490 started
Jun 2 13:29:37 localhost squid[10488]: Squid Parent: child process 10490 exited due to signal 6
Jun 2 13:29:40 localhost squid[10488]: Squid Parent: child process 11231 started






Jun 2 13:08:43 localhost (squid): WARNING: You should probably remove '10.16.11.1-10.16.11.20' from the ACL named

'lab'
Jun 2 13:08:43 localhost (squid): WARNING: '10.16.11.1-10.16.11.20' is a subnetwork of '10.16.11.1-10.16.11.20'
Jun 2 13:08:43 localhost (squid): WARNING: because of this '10.16.11.1-10.16.11.20' is ignored to keep splay tree

searching predictable
Jun 2 13:08:43 localhost (squid): WARNING: You should probably remove '10.16.11.1-10.16.11.20' from the ACL named

'lab'
Jun 2 13:08:43 localhost (squid): WARNING: action 'lab' (line 590) already has a password
Jun 2 13:09:39 localhost squid[10425]: Squid Parent: child process 10427 exited with status 0
Jun 2 13:09:40 localhost squid[10488]: Squid Parent: child process 10490 started
Jun 2 13:29:37 localhost squid[10488]: Squid Parent: child process 10490 exited due to signal 6
Jun 2 13:29:40 localhost squid[10488]: Squid Parent: child process 11231 started
Jun 2 13:57:31 localhost -- MARK --
Jun 2 14:03:19 localhost squid[10488]: Squid Parent: child process 11231 exited due to signal 6
Jun 2 14:03:22 localhost squid[10488]: Squid Parent: child process 11985 started
Jun 2 14:17:32 localhost -- MARK --
Jun 2 14:21:07 localhost squid[10488]: Squid Parent: child process 11985 exited with status 0
Jun 2 14:28:07 localhost squid[12786]: Squid Parent: child process 12788 started
Jun 2 14:46:03 localhost squid[12786]: Squid Parent: child process 12788 exited due to signal 6
Jun 2 14:46:06 localhost squid[12786]: Squid Parent: child process 12850 started
Jun 2 14:57:32 localhost -- MARK --
Jun 2 15:13:00 localhost squid[12786]: Squid Parent: child process 12850 exited with status 0
Jun 2 15:13:01 localhost squid[13604]: Squid Parent: child process 13606 started

também a seguinte mensagem...

Jun 2 09:55:25 localhost squid[5139]: Preparing for shutdown after 17561 requests
Jun 2 09:55:25 localhost squid[5139]: Waiting 30 seconds for active connections to finish
Jun 2 09:55:25 localhost squid[5139]: FD 19 Closing HTTP connection