Red Hat APPLICATION STACK 1.2 RELEASE Manuale Utente Scaricare il pdf (Pagina 24)

Chapter 4. Networking and Services

As a temporary workaround, systems that need to continue to use the weaker ciphers require the

allow_weak_crypto option in the libdefaults section of the /etc/krb5.conf file. This variable is

set to false by default, and authentication will fail without having this option enabled:

[libdefaults]

allow_weak_crypto = yes

Additionally, support for Kerberos IV, both as an available shared library and as a supported

authentication mechanism in applications, has been removed. Newly-added support for lockout

policies requires a change to the database dump format. Master KDCs which need to dump databases

in a format which older KDCs can consume should run kdb5_util's dump command with the -r13

option.

4.7. Mail

4.7.1. Sendmail

In some releases of Red Hat Enterprise Linux 5, the sendmail Mail Transport Agent (MTA) accepted

network connections from external hosts by default. In Red Hat Enterprise Linux 6, sendmail by default

only accepts connections from the local system (localhost). To grant sendmail the ability to act as a

server for remote hosts, perform one of the following steps:

• Edit /etc/mail/sendmail.mc and change the DAEMON_OPTIONS line to also listen on network

devices

• Comment out the DAEMON_OPTIONS line in /etc/mail/sendmail.mc. Then install the sendmail-

cf package and regenerate /etc/mail/sendmail.cf by running the following commands:

su -c 'yum install sendmail-cf'

su -c 'make -C /etc/mail'

4.7.2. Exim

Exim has been removed from Red Hat Enterprise Linux 6. Postfix is the default and recommended

MTA.

4.7.3. Dovecot

Dovecot configuration

The configuration for Dovecot 2.x has changed. The master configuration file /etc/dovecot.conf

has moved to /etc/dovecot/dovecot.conf and other parts of Dovecot configuration have moved

to /etc/dovecot/conf.d/*.conf. The majority of the configuration is the same and is compatible

with this new version; however, you can test your configuration and list which options have been

renamed, removed, or otherwise changed in this new version with the following command:

doveconf [-n] -c /old/dovecot.conf

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Red Hat APPLICATION STACK 1.2 RELEASE Manuale Utente Pagina 24