I ran into same issue with Sharepoint authentication in Squid-2.7-Stable7. I tried configuring "pipeline_prefetch off" in squid.conf and it worked. Please try that. To debug you should enable debug logs for squid at all levels using debug_options ALL,9. Then take packet capture at client with squid and without squid. See if some http headers are being removed by Squid. Then debug logs should tell you where in the code squid removes those http headers. Regards, Saurabh -----Original Message----- From: Xavier Magnaudeix [mailto:xavier@xxxxxxxxxx] Sent: Wednesday, March 02, 2011 10:05 PM To: 'Chad Naugle'; squid-users@xxxxxxxxxxxxxxx Subject: RE: Auth popup not shown on website This is weird. None of my squids/browsers want to show me the popup. -----Message d'origine----- De : Chad Naugle [mailto:Chad.Naugle@xxxxxxxxxxx] Envoyà : mercredi 2 mars 2011 17:24 à : 'Xavier Magnaudeix'; squid-users@xxxxxxxxxxxxxxx Objet : RE: Auth popup not shown on website My test also worked, using Squid 3.1.10. My best guess is "Connection-Pinning", a feature that does not exist in 2.5 or 3.0 branches. Please attempt to upgrade to either 2.7 or 3.1 branches, and see if that works. >>> "JC Putter" <jcputter@xxxxxxxxxxxx> 3/2/2011 11:05 AM >>> mmm... did you say the popup does not appear then using squid? I am using squid2.6stable21 and the pop appeared -----Original Message----- From: Xavier Magnaudeix [mailto:xavier@xxxxxxxxxx] Sent: 02 March 2011 06:03 PM To: 'JC Putter'; squid-users@xxxxxxxxxxxxxxx Subject: RE: Auth popup not shown on website The url is : http://reporting.generix.biz/QlikView/index.htm I tried with squid-3.0.STABLE7-4, squid-2.5.STABLE10-10 ... Dunno what is the type of auth that pops up, I'm not the owner of the website, I just want to use it. Xavier -----Message d'origine----- De : JC Putter [mailto:jcputter@xxxxxxxxxxxx] Envoyà : mercredi 2 mars 2011 16:54 à : 'Xavier Magnaudeix'; squid-users@xxxxxxxxxxxxxxx Objet : RE: Auth popup not shown on website Sure what is the url -----Original Message----- From: Xavier Magnaudeix [mailto:xavier@xxxxxxxxxx] Sent: 02 March 2011 05:49 PM To: squid-users@xxxxxxxxxxxxxxx Subject: Auth popup not shown on website Hi list, I have a problem with a specific website site not showing a login/password request when surfing through squid. When surfing out of squid, auth popup opens well. I tested out through a lot of different machines running different versions of squid, same issue. I'm not an expert and logs do not tell me what to do... Has anyone ever seen this? Is it possible to post the url here if someone wants to give it a try? Regards Xavier Travel Impressions made the following annotations ------------------------------------------------------------- "This message and any attachments are solely for the intended recipient and may contain confidential or privileged information. If you are not the intended recipient, any disclosure, copying, use, or distribution of the information included in this message and any attachments is prohibited. If you have received this communication in error, please notify us by reply e-mail and immediately and permanently delete this message and any attachments. Thank you."