Use Fail2ban and Postscreen to Fight Botnet Connections to Postfix


I noticed multiple unsuccessful connection attempts in my postfix server from various IPs. The EHLO response varies but many of them respond as "User\r\n". See the following log entries from my /var/log/postfix.log file...
Nov 10 19:20:58 mail postfix/postscreen[18652]: COMMAND PIPELINING from [162.142.125.10]:57044 after ??????: 6\2
Nov 10 19:20:57 mail postfix/postscreen[18652]: COMMAND PIPELINING from [162.142.125.10]:46298 after ??????: W\
Nov 6 05:57:36 mail postfix/postscreen[15159]: PREGREET 11 after 0.12 from [147.78.103.88]:56690: EHLO User\r\n
Oct 30 04:05:40 mail postfix/postscreen[8417]: PREGREET 11 after 0.13 from [87.120.84.90]:58426: EHLO User\r\n
Oct 30 04:54:26 mail postfix/postscreen[9258]: PREGREET 11 after 0.13 from [87.120.84.90]:51143: EHLO User\r\n
Oct 30 06:50:04 mail postfix/postscreen[11318]: PREGREET 11 after 0.13 from [147.78.103.88]:52788: EHLO User\r\n
Oct 30 05:37:00 mail postfix/postscreen[9963]: PREGREET 11 after 0.13 from [147.78.103.88]:54640: EHLO User\r\n

As you can see, these connection attempts are coming from many different IP addresses. The best way to handle these attempts is with a custom Fail2ban rule that can match against the EHLO response. Fail2ban is log monitoring software that is able to take action when it matches a rule. These actions can vary but the default is to "ban" the IP and/or port by creating a rule in iptables. I will walk through the setup of this custom Fail2ban rule and the subsequent testing and verifying of the rule.


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https://tictactech.net/category-blog/lin...net-logins

Send Email in your PowerShell Script - The Modern Method


With modern companies using hosted email solutions, Microsoft has deprecated the use of the Send-MailMessage PowerShell cmdlet. The supported to way to send emails from a PowerShell script is with the Microsoft Graph API. Unfortunately, this is not as simple as using an on-premises SMTP server, but it's much more secure. And by building a proper PowerShell function, it's just as easy to integrate within your scripts. This does require an Office365 tenant and subscription. I will outline the steps and give an example of how to send emails with this method.

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https://tictactech.net/category-blog/pow...ern-method

TechPowerUp x Team Group Black Friday and Cyber Monday Hardware Giveaway

TechPowerUp partners with Team Group to bring you the Black Friday and Cyber Monday (BF-CM) Bonanza Giveaway! Open worldwide, our Giveaway presents a chance to grab one of four Team Group high performance memory and SSD products spanning across its popular brands, T-Force Xtreem, T-Force Cardea, and T-Create. There are four prizes up for grabs, which include a Team Group T-Force Xtreem DDR5-8200 48 GB (2x 24 GB) memory kit, a Team Group T-Create Expert DDR5-7200 32 GB (2x 16 GB) White memory kit; a Team Group T-Force Cardea A440 Pro Graphene 1 TB M.2 NVMe SSD, and a Team Group MP44 2 TB M.2 NVMe Gen 4 SSD.

The T-Force Xtreem DDR5-8200 48 GB memory kit is the star attraction here, the perfect match for a high-end build. The T-Create Expert DDR5-7200 32 GB is pretty much all the speed and capacity you need to crush creator workloads. The MP44 is a well balanced Gen 4 SSD with 2 TB for your entire game library. The Cardea A440 Pro would make for an excellent game library addition to your build. To participate, simply fill up a short form to help us get back to you if you've won, and answer and answer a few Team Group product-related questions. The Giveaway is open until November 15, 2023. Good Luck!

For more information, and to participate, visit this page.


https://www.techpowerup.com/315432/techp...e-giveaway

(PR) BeagleBoard.org Announces New BeagleV-Fire FPGA and RISC-V Single Board Computer

BeagleBoard.org, a pioneer in open-source single-board computers (SBCs), is excited to unveil the BeagleV -Fire, a revolutionary SBC powered by the Microchip's PolarFire MPFS025T FCVG484E 5x core RISC-V System on Chip (SoC) with FPGA fabric. This remarkable addition to the BeagleBoard.org BeagleV family of boards opens up new horizons for developers, tinkerers, and the open-source community to explore the vast potential of RISC-V architecture and FPGA technology.

BeagleV -Fire is the second board in the BeagleV series of single board computers (SBCs) from BeagleBoard.org. BeagleV -Fire like other BeagleV SBCs, is set to revolutionize the world of embedded systems and empower developers and enthusiasts worldwide. After the launch of BeagleV -Ahead, BeagleV -Fire represents another significant milestone in the democratization of computer architecture and open-source hardware development for the masses. Built around the powerful and energy-efficient RISC-V instruction set architecture (ISA) along with its versatile FPGA fabric, BeagleV -Fire SBC offers unparalleled opportunities for developers, hobbyists, and researchers to explore and experiment with RISC-V technology. Read full story


https://www.techpowerup.com/315426/beagl...d-computer

OLED Display and more battery!! GPU always at 1600MHZ. And its coming next week
https://www.techpowerup.com/315588/valve...-internals

What are some of the best free Joomla 5 plugins for displaying article content like how to guides on your front page? Also what are some of the best free Joomla templates that are compatible with Joomla 5 and work well for sites with how to guides?

Will a new mainline Might and Magic game ever be made again?

What makes a great computer RPG? Give specifics about what aspects of the gameplay are important to making a great computer RPG.

Write me a guide on setting up a docker container for Joomla on any linux distribution. Include all the steps from a fresh install to a complete installation.

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Anyone tried Super Mario Wonder on Yuzu? I've tried it on steam deck and after a rocky beginning with FPS jumping between 30-60, it seems to even out and I get a fluid 60fps. Amazing the steamdeck emulates switch games almost as well as they run natively.

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