Hi Amos, Thanks for looking into this! I've checked my log and it appears that I only get 404 on this line of access.log: *1392116368.550 0 10.10.10.222 TCP_MISS/404 0 CONNECT wfbssvc51.icrc.trendmicro.com:443 - DIRECT/- -* 200 I get on this line: *1392116315.477 1 10.10.10.58 TCP_MISS/200 3422 GET http://wfbs-svc50-en.url.trendmicro.com/T/128/zNEsOn1a_kd_RI6YGnho8misgXDV55wymVwCQ4bMkhKG96nRsqt5kbe3FXTEhFZ_BNoWB3h1AxoFMOyM6JA-g1vTJNr2jzhOf1w4-gZiCAg_pEGvciUDeQypi5XOcFBZ - DIRECT/127.0.1.1 text/html* Thanks again! ----- squid.conf -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/squid-Office365-Trend-Micro-tp4664707p4664714.html Sent from the Squid - Users mailing list archive at Nabble.com.