Hi,List, The wccp configration works fine with squid3.3.11, when upgraded to squid 3.4 r13095, it's report: # /usr/local/squid34/sbin/squid -f /squid/wccp-instance.conf -N -d1 FATAL: Bungled /squid/wccp-instance.conf line 24: wccp2_service_info 80 protocol=tcp flags=src_ip_hash priority=240 ports=80,8000,8080 Squid Cache (Version 3.4.3-BZR): Terminated abnormally. CPU Usage: 0.010 seconds = 0.010 user + 0.000 sys Maximum Resident Size: 37440 KB Page faults with physical i/o: 0 Then I delete "8000,8080" port ,it's no error messages, but the wccp2 router does not responsed it. Regards Simon