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Cisco Services & Technologies
This article shows how to fix the Cisco VPN Reason 442: Failed to enable Virtual Adapter error on the Windows 7 (32bit or 64bit) operating system. If…
Cisco CallManager-CCME
This article will show how to configure CallManager Express (CME) for the IP phone firmware upgrade process. Upgrading your Cisco IP phones is genera…
Cisco Switches
There’s a new switch around the block and its name is Catalyst 3850 – Cisco’s latest addition to its successful Catalyst series switches. The Cisco C…
Cisco Services & Technologies
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 screensho…

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Data Center Articles:

The Cisco NX-OS checkpoint feature provides the capability to capture at any time a snapshot (backup) of the Cisco Nexus configuration…
Whether you’re new to Cisco Nexus switches or have been working with them for years this article will show how to get around the Nexus NX-OS usi…
This article shows how to perform an ISSU (In-Service Software Upgrade) on a Nexus Data Center switch (7000 and 7700 models) and avoid service and ne…
This article introduces the Cisco Nexus product family (Nexus 9000, Nexus 7000, Nexus 5000, Nexus 3000, Nexus 2000, Nexus 1000V and MDS 9000). We exp…

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Cisco Switches
It's no news that we here at Firewall.cx enjoy writing about our installations of Cisco equipment and especially devices that we don’t get to see and play…
Cisco Switches
This article covers popular Layer 2 & Layer 3 network attacks with a focus on DHCP Starvation Attacks, Man-in-the-Middle attacks, unintentional rogue…
Cisco Switches
Driven by our thirst for technical material and experience, we thought it would be a great idea to start presenting various installations of Cisco equipme…
Cisco Switches
Errdisable is a feature that automatically disables a port on a Cisco Catalyst switch. When a port is error disabled, it is effectively shut down and…

Cisco Firewalls
The Cisco ASA Firewall 5500-X series has evolved from the previous ASA 5500 Firewall series, designed to protect mission critical corporate networks and d…
Cisco Firewalls
The Cisco ASA 5500 series security appliances have been around for quite some time and are amongst the most popular hardware firewalls available in the ma…
Cisco Firewalls
This article examines the concept of NAT Reflection, also known as NAT Loopback or Hairpinning, and shows how to configure a Cisco ASA Firewall running AS…
Cisco Firewalls
In late 2014, Cisco announced the new licensing model for the latest AnyConnect Secure Mobility client v4.x. With this new version, Cisco introduced a num…

Popular Topics

Virtualization & VM Backup
When considering your VM backup solution, key features such as deduplication are incredibly important. This is not simply from a cost perspective but also…
Virtualization & VM Backup
Microsoft 365 is an incredibly powerful software suite for businesses, but it is becoming increasingly targeted by people trying to steal your data. The g…
Palo Alto Networks
Palo Alto Networks Next-Generation Firewalls rely on the concept of security zones in order to apply security policies. This means that access lists (fire…
Palo Alto Networks
Keeping your Palo Alto Firewall up to date with the latest PAN-OS software updates is an important step to ensure your organization is protected against t…