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The pam_krb5 on RHEL5 prompts for password even though valid kerberos cache is present when running sudo.

Solution Verified - Updated 2012-10-23T07:14:27+00:00 -

Issue

With pam_krb5, sudo prompts for password while executing sudo command even though valid kerberos cache is present.
As per pam_krb5 man page the existing_ticket option will allow a user to authenticate with an existing cache. However, pam always looks at /tmp/krb5cc_0, the root kerberos cache, as opposed to the user cache created on login.

Environment

Red Hat Enterprise Linux 5 and later.
krb5-workstation-1.6.1-70.el5
sudo-1.7.2p1-13.el5

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