IT-REACT

How to check if a remote port is open (Windows)

I’m sure there were times when you had to check if a port is accessible from one computer to another. In the earlier days we used to test network connectivity to a specific port of the remote computer using telnet command. Telnet used to come preinstalled in Windows, but in latest Windows OS not anymore. In these days some companies have restrictions on installing third party programs or new services

pfSense – re0 Watchdog Timeout Error

A few weeks ago my Internet started to have problems. The connection was dropping every 2-3 days and it couldn’t recover itself . The simpler solution found was to reset the pfSense Firewall. At the beginning I thought that is only an isolated case but the problem seemed to become something permanent. So I decided to spend some time to check and try to fix this issue. Step one –

Create a Smart Home System with a Raspberry Pi, a few sensors and Node-RED – Part 2

In the first part we learned the logic and components of the system and we configured the central component – Raspberry PI. In today’s post we’ll add some sensors and relays and we’ll integrate them with the central server via wi-fi, using the ESP8266 wireless modules. Let’s begin! Step one – Install and configure ESP8266 wireless module I’ve used so far in my projects two types of wireless modules and

Create a Smart Home System with a Raspberry Pi, a few sensors and Node-RED – Part 1

This will be the first post out of series of posts about creating a smart home system with Raspberry Pi, different kind of sensors and the powerful visual tool for wiring sensor data – Node-RED. Node-RED is a flow-based development tool for visual programming for wiring together hardware devices, APIs and online services in new and interesting ways. It provides a browser-based editor which can be used to wire together

Convert an old laptop single NIC into an OPNsense Firewall/Router

In today’s post, I would like to show you the process of transforming a single NIC old laptop into an OPNsense firewall/router. I wanted for some time to install pfSense in my home network, but I didn’t want to buy an expensive already made firewall device. After spending a few days looking for a solution, I found at some point that Dell PowerEdge R210 II is quite used as hardware

vSphere Web Client (Flash) no longer works with Firefox after upgrading from vCenter 6.0 to 6.5

We’ve just finished upgrading VMWare infrastructure from version 6.0 to version 6.5 and we’ve noticed that vSphere Web Client (Flash) is not working anymore with Firefox. After accessing vCenter IP Address, we select vSphere Web Client (Flash) as in the screenshot and we are getting the following error: “Error: Error #2134at com.vmware.flexutil.logging::StorageObjectWriter/initialize()at com.vmware.flexutil.logging::StorageObjectWriter$/getInstanceByName()at com.vmware.flexutil.logging::LocalStoreTarget/initialize() at com.vmware.flexutil.logging::LogManager$/addTarget()at com.vmware.flexutil.logging::LogManager$/addConfiguration()at com.vmware.flexutil.logging::LogManager$/onConfigLoaded()at ConfigurationLoader/onLoadSuccess()at flash.events::EventDispatcher/dispatchEvent()at flash.net::URLLoader/onComplete()” Our Firefox version is 70.0.1. The solution is pretty

How to add a USB Disk as VMFS Datastore in ESXi 6.7

After some time using VMWare Workstation as a playground for my VM home lab environment, and after learning and testing with VM ESXi Hosts, I decided that is time to move to a hardware lab. So I achieved, for the start, 2 servers for the ESXi hosts, and because there is no HDD on the servers, I have installed the ESXi software on an USB Stick. For the storage I

How to enable EVC (Enhanced vMotion Compatibility) on VMWare cluster v6.0

In today’s post we’ll see what is EVC, in which case is needed and how we can enable it on VMWare cluster. What is EVC Let’s see first what is EVC – source VMWare: EVC stands for Enhanced vMotion Compatibility. This is a vCenter cluster feature which simplifies vMotion compatibility issues across CPU generations. EVC automatically configures server CPUs with Intel FlexMigration or AMD-V Extended Migration technologies to be compatible

VMWare: vCenter 6.5 Upgrade Fails with VIX error

I had to upgrade vCenter from 6.0 to 6.5. It’s not the first one, I made a few recently cause we have a client with many sites that should be upgraded. Everything was good prepared or at least I was thinking so and I was ready to start. In the evening, after the working hours as it was planned, I’ve started and quite soon, at the 3rd step of stage