[SQU] Hack attempt?

Hi, The following appeared in /var/log/messages, can anybody explain the
meaning of this to me please?

Could it be someone attempting to gain unauthorised access?

Oct 4 12:07:38 gateway squid[315]: aclMatchAcl: proxy_auth password not
applicable on accelerated requests.
Oct 4 12:08:09 gateway last message repeated 192 times
Oct 4 12:10:10 gateway last message repeated 746 times
Oct 4 12:20:11 gateway last message repeated 3722 times
Oct 4 12:30:12 gateway last message repeated 3627 times
Oct 4 12:40:13 gateway last message repeated 2725 times
Oct 4 12:50:14 gateway last message repeated 2774 times
Oct 4 13:00:15 gateway last message repeated 2716 times
Oct 4 13:10:16 gateway last message repeated 2776 times
Oct 4 13:20:17 gateway last message repeated 2754 times
Oct 4 13:30:18 gateway last message repeated 2780 times
Oct 4 13:40:19 gateway last message repeated 2366 times
Oct 4 13:50:20 gateway last message repeated 2548 times
Oct 4 14:00:21 gateway last message repeated 2558 times
Oct 4 14:10:22 gateway last message repeated 3152 times
Oct 4 14:20:23 gateway last message repeated 2662 times
Oct 4 14:30:23 gateway last message repeated 3079 times
Oct 4 14:40:23 gateway last message repeated 3058 times
Oct 4 14:50:23 gateway last message repeated 3168 times
Oct 4 15:00:24 gateway last message repeated 3636 times
Oct 4 15:10:24 gateway last message repeated 3680 times
Oct 4 15:20:24 gateway last message repeated 3648 times
Oct 4 15:30:25 gateway last message repeated 3219 times
Oct 4 15:40:25 gateway last message repeated 2977 times
Oct 4 15:50:25 gateway last message repeated 2648 times
Oct 4 15:50:59 gateway last message repeated 146 times

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