Hi, I have made Squid 3 PRE6 woking in SSL without client authentication. It works fine. Then I combined the cert file and key file into a pkcs12 file and inputed into the brower and add the CA file into squid.conf as clientca=<the CA file used to sign the cert file>. I open my Squid with MS IE, Squid error log said it won't return certificate. I use Firefox, it says there is an error. I have already got a SSL cert from InstantSSL. There were no complain both from IE and Firefox when without client authenticaton. The problem is that we do not have a procedure to set up client authentication for Squid. Please help!