Hi, I know this is a subject that has been put on the table many times, but I wanted to share with you my experience with squid + sharepoint. Squid Cache: Version 3.2.7-20130211-r11781 I am having an issue with autehtication : when accessing the sharepoint server, I do get a login/pw popup, I can login and see some of the pages behind, but when doing some operation, even though I am supposed to be logged in, the autentcation popup comes back. Here is what I find the the access log : 1360679927.561 43 X.X.X.X TCP_MISS/200 652 GET http://saralex.hd.free.fr/_layouts/images/selbg.png - FIRSTUP_PARENT/192.168.100.XX image/png 1360679928.543 37 X.X.X.X TCP_MISS/401 542 GET http://saralex.hd.free.fr/_layouts/listform.aspx? - PINNED/192.168.100.XX - 1360679928.665 58 X.X.X.X TCP_MISS/401 795 GET http://saralex.hd.free.fr/_layouts/listform.aspx? - PINNED/192.168.100.XX - 1360679928.753 229 X.X.X.X TCP_MISS/200 20625 GET http://saralex.hd.free.fr/_layouts/images/fgimg.png - FIRSTUP_PARENT/192.168.100.XX image/png 1360679928.788 68 X.X.X.X TCP_MISS/302 891 GET http://saralex.hd.free.fr/_layouts/listform.aspx? - PINNED/192.168.100.XX text/html 1360679928.921 45 X.X.X.X TCP_MISS/401 542 GET http://saralex.hd.free.fr/Lists/Tasks/NewForm.aspx? - PINNED/192.168.100.XX - 1360679929.019 47 X.X.X.X TCP_MISS/401 795 GET http://saralex.hd.free.fr/Lists/Tasks/NewForm.aspx? - PINNED/192.168.100.XX - 1360679929.656 81 X.X.X.X TCP_MISS/200 1986 GET http://saralex.hd.free.fr/_layouts/images/loadingcirclests16.gif - FIRSTUP_PARENT/192.168.100.XX image/gif 1360679930.417 1322 X.X.X.X TCP_MISS/200 130496 GET http://saralex.hd.free.fr/Lists/Tasks/NewForm.aspx? - PINNED/192.168.100.XX text/html 1360679934.618 53 X.X.X.X TCP_MISS/401 542 GET http://saralex.hd.free.fr/_layouts/iframe.aspx? - PINNED/192.168.100.XX - 1360679934.729 51 X.X.X.X TCP_MISS/401 795 GET http://saralex.hd.free.fr/_layouts/iframe.aspx? - PINNED/192.168.100.XX - could this be a pinning issue? Is V2.7 STABLE managing these things in a nicer way? Thank you very much Alex