Hi, The knowledge of which OS/Platform could help answering to you .... >From your previous messages on the list, I can suppose that you are speaking about Windows. If so, the message is correct, Windows sockets don't provide IP_TOS support. Regards Guido Serassio Acme Consulting S.r.l. Microsoft Gold Certified Partner VMware Professional Partner Via Lucia Savarino, 1 10098 - Rivoli (TO) - ITALY Tel. : +39.011.9530135 Fax. : +39.011.9781115 Email: guido.serassio@xxxxxxxxxxxxxxxxx WWW: http://www.acmeconsulting.it -----Messaggio originale----- Da: winetbox@xxxxxxxxx [mailto:winetbox@xxxxxxxxx] Inviato: giovedì 24 giugno 2010 13.26 A: squid-users@xxxxxxxxxxxxxxx Oggetto: setsockopt(IP_TOS) not supported on this platform I set tcp_outgoing_tos 0x30 And I keep getting error on cache log: comm_open: setsockopt(IP_TOS) not supported on this platform Thus the TOS is not working. Anyone fix it yet? Thanks Sent from my BlackBerry® powered by Sinyal Kuat INDOSAT