Hi All, I downloaded SSL Certificate from verisign and exported pvt key from windows 2003 server in squid.conf I have this https_port 10.200.22.49:443 accel \ cert=/etc/squid/keys/mail.airarabia.ae_cert.pem \ key=/etc/squid/keys/pvtkey.pem defaultsite=mail.airarabia.ae when access https://mail.airarabia.ae browser gives error Secure Connection Failed mail.airarabia.ae uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. (Error code: sec_error_unknown_issuer) * This could be a problem with the server's configuration, or it could be someone trying to impersonate the server. * If you have connected to this server successfully in the past, the error may be temporary, and you can try again later. and in cache.log I get this clientNegotiateSSL: Error negotiating SSL connection on FD 23: error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca (1/0) What could be the problem please help //Remy ------------------------------------------------------------------------------ Disclaimer and Confidentiality This material has been checked for computer viruses and although none has been found, we cannot guarantee that it is completely free from such problems and do not accept any liability for loss or damage which may be caused. Please therefore check any attachments for viruses before using them on your own equipment. If you do find a computer virus please inform us immediately so that we may take appropriate action. This communication is intended solely for the addressee and is confidential. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. The views expressed in this message are those of the individual sender, and may not necessarily be that of ISA.