Squid Error

Hi all ,

i m getting below error in access.log while running skype application on linux.

Proxy packages : Squid redirected through SquidGuard with LDAP auth.
system : Ubuntu 6.06
Firewall : pf

227032649.603 0 system_IP_add TCP_DENIED/407 1802 GET http://ui.skype.com/ui/2/2.0.0.72/en/getlatestversion? - NONE/- text/html
1227032649.611 0 system_IP_add TCP_DENIED/407 1802 GET http://ui.skype.com/ui/2/2.0.0.72/en/getlatestversion? - NONE/- text/html
1227032649.618 0 system_IP_add TCP_DENIED/407 1802 GET http://ui.skype.com/ui/2/2.0.0.72/en/getlatestversion? - NONE/- text/html
1227032649.625 0 system_IP_add TCP_DENIED/407 1802 GET http://ui.skype.com/ui/2/2.0.0.72/en/getlatestversion? - NONE/- text/html
1227032649.633 0 system_IP_add TCP_DENIED/407 1802 GET http://ui.skype.com/ui/2/2.0.0.72/en/getlatestversion? - NONE/- text/html
1227032649.641 0 system_IP_add TCP_DENIED/407 1802 GET http://ui.skype.com/ui/2/2.0.0.72/en/getlatestversion? - NONE/- text/html
1227032649.649 0 system_IP_add TCP_DENIED/407 1802 GET http://ui.skype.com/ui/2/2.0.0.72/en/getlatestversion? - NONE/- text/html
1227032649.657 0 system_IP_add TCP_DENIED/407 1802 GET http://ui.skype.com/ui/2/2.0.0.72/en/getlatestversion? - NONE/- text/html

Please help to solve this issue