Subnet Mask Cheat Sheet
Without further adieu: Addresses Hosts Netmask Amount of a Class C /30 4 2 255.255.255.252 1/64 /29 8 6 255.255.255.248 1/32 /28 16 14 255.255.255.240
Operating Systems
How to upgrade Windows 2019 Server evaluation version to Windows 2019 Standard Version
You will still need a key to activate Windows, so this procedure is only useful if you went the evaluation route first. Do this in
How to enable Remote Desktop Protocol for Administration Purposes on Newly Created Windows 2019 Server
Guide to Enable Remote Desktop for 2 Administrative Users Start Server Manager Local Server Remote Desktop will be disabled. Enable it by clickon the ‘Disabled’.
Unable to ping newly installed Windows 2019 server
TL;DR Guide Search Windows Defender Firewall with Advanced Security Inbound Rules Scroll, scroll, scroll File and Printer Sharing (Echo Request – ICMPv4-In) Click click Enabled
How to use SNMP to monitor Asterisk Extensions for Unavailable, In Use, Not In Use, or Ringing
Having a switchboard that’s not working properly can lead to lost business. But what’s even worse is having a phone system with many extensions and
How to change the BIND DNS zone file format using Webmin
When doing a Domain Health Check on MX Toolbox you might be concerned because you receive the following message: SOA Serial Number Format is Invalid
A curated list of useful certbot commands
About Certbot Certbot is a lifesaver when the user interface you use to renew certificates does not deliver anymore. Some servers of course come without
What are all the different versions of Windows 10 out there?
Windows 10 is probably the best Microsoft OS in a while. What’s also great about Windows 10 is Microsoft is constantly adding to it, yet
How to use `ps` or `top` and flag/filter it properly to see high loads
ps or top are often the first utilities a Linux administrator reaches for when looking at what’s happening on a system. It’s very much the
How to upgrade from Ubuntu 18.04 to Ubuntu 20.04
In a hurry to upgrade from Ubuntu 18.04 to 20.04, because, you can? Final question, and don’t phone a friend. Do you have a backup?