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Introducing The Cisco Technical Support Mobile Ap…
By: Arani Mukherjee & Chris Partsenidis
For a successful networking professional it is essential to gain information on-the-fly about the network infrastructure he or she is working on. For a su…
How to Fix Cisco VPN Client Error 51 – Unable to…
Apple Mac OS X users are frequently faced with the Cisco VPN Client Error 51 - Unable to Communicate with the VPN Subsystem as shown in the screenshot below:
When this error is produced, users wil…
Install & Fix Cisco VPN Client on Windows 10 (32…
This article shows to how correctly install Cisco VPN Client (32 & 64 bit) on Windows 10 (32 & 64 bit) using simple steps, overcome the ‘This app can’t run on this PC’ installation error, plu…
Free Cybersecurity Essentials 2026 Update: New Se…
Cybersecurity frameworks continue to evolve as organisations face increasingly sophisticated threats. Recent updates to widely adopted baseline security standards are raising the bar—placing stronger…
Manchester Signal Encoding
The device driver software receives a frame of IP, IPX, NetBIOS, or other higher-layer protocol data. From this data, the device driver constructs a frame, with appropriate Ethernet header informatio…
Free Cisco IP Phone & ATA Firmware (SCCP & SIP)…
Firewall.cx readers can now download free Cisco firmware files for all Cisco IP Phones & Cisco ATA devices. Our new Cisco IP Phone & ATA Firmware Download section contains the latest SCCP (Sk…
Creating a Virtual Machine in Windows Hyper-V. Co…
Our previous articles covered basic concepts of Virtualization along with the installation and monitoring of Windows 2012 Hyper-V. This article takes the next step, which is the installation of a gue…
Fix Cisco VPN Client Break After Windows 10 Anniv…
Windows 10 latest update 1607 code named Anniversary update promises to introduce a number of significant enhancements including breaking your trustworthy Cisco IPSec VPN client. After installing the…
The IEEE 802.3 Frame Format
The following is a description of the Ethernet Frame Format described in the IEEE 802.3 Specification. The 802.3 Specification defines a 14 byte Data Link Header followed by a Logical Link Control He…
Free IT Operations Management (ITOM) & Artificial…
With digital transformation revolutionizing the IT industry, Artificial Intelligence for IT Operations (AIOps) has become one of the hottest topics in the IT operations management (ITOM) space.
At t…
Free Webinar: Scripting & Automation in Hyper-V w…
System Center Virtual Machine Manager (SCVMM) provides some great automation benefits for those organizations that can afford the hefty price tag. However, if SCVMM isn’t a cost effective solution fo…
How To Secure Your SD-WAN. Comparing DIY, Managed…
With so much enterprise network traffic now destined for the cloud, backhauling traffic across an expensive MPLS connection to a data center to apply security policy no longer makes sense. Software-d…
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