Using NSLOOKUP to view DKIM records Rumi, April 14, 2022 NSLOOKUP is a quick and convenient way to verify that your DK/DKIM records are set up properly. The policy for DK/DKIM is a TXT record at this location: _adsp._domainkey.<domain.com> For the selector record you have to use: <selector>._domainkey.<domain.com> For example, do a NSLOOKUP for TXT at: c3po._domainkey.altn.com Open the Start… Continue Reading
A Presentation on Cloud Adoption for project managers with cyber security strategy Rumi, April 5, 2022April 6, 2022 It was a long presentation that I gave as a guest presenter to PMI Bangladesh chapter. The recording video is added- And for those who wish to have the the document to download can get it here. Cloud-Adoption-Project-Managers-1.3 Continue Reading
Remove Old Kernels of Debian/Ubuntu Rumi, April 1, 2022 To find out the current version of Linux kernel running on your system, use the following command. $ uname -sr Linux 4.12.0-041200-generic To list all installed kernels on your system, issue this command. $ dpkg -l | grep linux-image | awk ‘{print$2}’ linux-image-4.12.0-041200-generic linux-image-4.8.0-22-generic linux-image-extra-4.8.0-22-generic linux-image-generic Remove Old Unused Kernels… Continue Reading
Reboot Windows 10 using RDP Rumi, March 26, 2022 This article is for sysadmins who know better, wanting to Shut down or Restart (or even enter Sleep) over RDP anyway. Using Command Prompt Open a Command Prompt a. To initiate a Shut down, type: shutdown /s /t 0 then press Enter Continue Reading
Enable TLS 1.0 in Firefox Browser Rumi, March 26, 2022 Firefox 43 supports TLS 1.0, 1.1, and 1.2 by default. You shouldn’t need to make any changes, but you can double-check the settings here if you like: (1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful…. Continue Reading
Add SNMP to Windows Server- 2012 Rumi, March 19, 2022 This step-by-step article describes how to configure the Simple Network Management Protocol (SNMP) Service in Windows Server 2012/2012R2. We will install SNMP service and configure SNMP security. SNMP Service Installation Open Server Manager and then click Add Roles and Features. In Select Features, check the box next to SNMP Service…. Continue Reading
Solving A remote code execution vulnerability exists in the Credential Security Support Provider protocol (CredSSP) on Windows RDP Rumi, March 18, 2022 WORKAROUND Use the group policy settings changes described below to rollback the changes to ‘Vulnerable’ state to allow RDP access. 1. Open Group Policy Editor, by executing gpedit.msc 2. Policy path: Computer Configuration -> Administrative Templates -> System -> Credentials Delegation Run gpedit.msc and expand Administrative Templates Continue Reading
Install phpIPAM on Ubuntu 20.04/18.04 Rumi, December 25, 2021December 25, 2021 The objective of this guide is to help you Install and Configure phpIPAM on Ubuntu 20.04/18.04 Linux distribution. phpIPAM is an open-source php-based web IP address management application (IPAM). Its goal is to provide light, modern and useful IP address management. phpIPAM uses MySQL database backend and jQuery libraries, Ajax and HTML5/CSS3… Continue Reading
Fixing Vesta CP Exim Email Incoming error with T=local_delivery defer (-1): Malformed value “0MM” Rumi, December 24, 2021December 25, 2021 ******** Applicable for vesta cp 1.0.0-5 version) ******** If you lately encounter an issue with mail incoming with vesta cp after an auto update took place, your /var/log/exim/main.log shows something similar below- 2021-12-19 03:39:42 1mxheU-000374-0o == mail@domain.com R=localuser T=local_delivery defer (-1): Malformed value “0MM” (expansion of “${extract{6}{:}{${lookup{$l$…. Step-1 Finding vesta… Continue Reading
Pushing Docker Images to a Docker Repository Rumi, December 21, 2021 The next logical step after creating a new image from an existing image is to share it with a select few of your friends, the whole world on Docker Hub, or other Docker registry that you have access to. To push an image to Docker Hub or any other Docker… Continue Reading