Hello Guys, Sorry i'm late, but recently set up a squid on a debian box patched with tproxy and compiled iptables like you did and everything seems woking except this error message on the cache log about the "port=0 ERROR ASSIGN".  tproxy ip=179.166.10.3,0x3017477,port=0 ERROR ASSIGN can't connect to the outside if the tproxy iptables rules loaded. Googled for some answer but no succes. If this issue is solved any  kind of help would be much appreciated, Thanks and more power.