+++ This bug was initially created as a clone of Bug #625685 +++ +++ This bug was initially created as a clone of Bug #625676 +++ Description of problem: I'm unable to use curl with all https:// URLs when my proxy uses kerberos authentization: curl --proxy http://myproxy:3128 --proxy-negotiate --proxy-user : https://email.seznam.cz 407 Proxy Auth required when curl --proxy http://myproxy:3128 --proxy-negotiate --proxy-user : http://email.seznam.cz works ok. This bug was already fixed by curl developer(s) in git. Let's see: https://sourceforge.net/tracker/?func=detail&aid=3046066&group_id=976&atid=100976 I need fix for all supported Fedora and RHEL distributions as soon as possible. May I add same bug report for RHEL or is this bug report enough for it? Version-Release number of selected component (if applicable): $ curl -V curl 7.19.7 (i386-redhat-linux-gnu) libcurl/7.19.6 NSS/3.12.6.2 zlib/1.2.3 libidn/1.9 libssh2/1.2.4 Protocols: tftp ftp telnet dict ldap ldaps http file https ftps scp sftp Features: GSS-Negotiate IDN IPv6 Largefile SSL libz How reproducible: We have a squid with kerberos authentization. curl --proxy http://myproxy:3128 --proxy-negotiate --proxy-user : https://email.seznam.cz 407 Proxy Auth required when curl --proxy http://myproxy:3128 --proxy-negotiate --proxy-user : http://email.seznam.cz works ok. Steps to Reproduce: 1. Install and setup squid with kerberos negotiation auth. 2. curl --proxy http://myproxy:3128 --proxy-negotiate --proxy-user : https://email.seznam.cz