Tag: Security

Enabling DKIM on Microsoft Exchange Server 2016

This post relates to my experience and the issues I’ve faced with installing the latest version of ‘Exchange DKIM Signer‘ (on time of writing 3.2.8) on Microsoft Exchange Server 2016 without internet access. In case you are using Microsoft Exchange Server (2007, 2010, 2013, 2016, 2019) and you want to enable DKIM on it, this […]

Updated: December 19, 2020 — 4:38 PM

SPF, DMARC and DKIM

Image from 'dmarc.org'

This post is general information for next post.In order to make email transaction more secure, below subject can be consider, as part of securing email transaction. SPF DMARC DKIM By transaction, I don’t mean the transfer of email itself but the fact that receiver can be sure they get the right email and the sender […]

Updated: December 18, 2020 — 8:11 PM

How to check for “VMSA-2018-0025”

On “2018-10-09” VMware announced a new security advisory “VMSA-2018-0025“. VMware ESXi, Workstation and Fusion contain a denial-of-service vulnerability due to an infinite loop in a 3D-rendering shader. Successfully exploiting this issue may allow an attacker with normal user privileges in the guest to make the VM unresponsive, and in some cases, possibly result other VMs […]

Updated: October 20, 2018 — 5:06 PM

Disabling upload feature for ShareX

There’s a free interesting application called “ShareX” which is great for lots of different tasks such as “screen shot, screen recording, file uploading and etc.”. If you interested on automatically uploads new screen shots online and share, then you might find this application very useful. One of useful feature in this application is the upload […]

Updated: October 20, 2018 — 2:45 PM

SSH & 2FA on Linux

There are multiple ways to make an SSH connection more secure and one of them is adding “Two Factor Authentication (2FA)” to the system and integrate it with ssh connectivity. Here the steps that could help with adding this feature to the system and its integration. This feature could be added to a different distribution […]

Updated: April 15, 2018 — 8:33 PM