Upgrade Kali Linux 2019.x to Kali Linux 2020.x

Posted on 20th February 202020th February 2020 by michaelf

For all existing installation of Kali Linux rolling release, you can always do a quick update. But first, ensure you have the official Kali repositories enabled. sudo tee /etc/apt/sources.list<<EOF deb http://http.kali.org/kali kali-rolling main non-free contrib EOF Take note of the current release. $ cat /etc/os-release PRETTY_NAME=”Kali GNU/Linux Rolling” NAME=”Kali GNU/Linux” ID=kali VERSION=”2019.4″ VERSION_ID=”2019.4″ VERSION_CODENAME=”kali-rolling” ID_LIKE=debian Read more about Upgrade Kali Linux 2019.x to Kali Linux 2020.x[…]

Simple Postfix Hardening

Posted on 30th May 201922nd September 2019 by michaelf

ADD TO /etc/postfix/main.cf vi /etc/postfix/main.cf # Hardening SSL configuration# # enable opportunistic TLS support in the SMTP server and clientsmtp_tls_security_level = maysmtp_tls_loglevel = 1 # only offer authentication after STARTTLSsmtpd_tls_auth_only = yes # Disable SSL compressiontls_ssl_options = NO_COMPRESSION # Disable SSLv2 and SSLv3 leaving TLSv1, TLSv1.1 and TLSv1.2 enabled.smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3smtpd_tls_protocols = !SSLv2 Read more about Simple Postfix Hardening[…]

Reading message content on postfix queue

Posted on 30th May 201930th May 2019 by michaelf

Get the id of the message by mailq | grep “search something” Then postcat -q MESSAGE_ID

Postfix Commands to manage the Postfix queue

Posted on 13th July 201813th July 2018 by michaelf

To show whats in the queue #postqueue -p To force the queue to re-attempt a send #postqueue -f To delete the queue #postsuper -d all To delete a specific mail #postsuper -d queueid

Add Cron Jobs – Linux / Suse

Posted on 6th November 2017 by michaelf

Login to your server with SSH Type crontab -l to display list of cron jobs, Type crontab -e to edit your crontab, Add 0 4 * * * /etc/init.d/mysqld restart to restart Mysql everyday at 4 AM, Add 0 5 * * * /etc/init.d/httpd restart to restart Apache everyday at 5 AM and Add 0 Read more about Add Cron Jobs – Linux / Suse[…]