High-Availability
Virtual Appliance Load Balancing
A virtual Load Balancer is a relatively new concept in load balancing based on the principle of virtualisation and, more specifically, virtual machines. A virtual machine is a self contained software product including an operating system and application designed to run in a virtual environment such as VMware or Microsoft Virtual Server. Traditionally virtual load [...]
What is web acceleration in Load balancing
Web acceleration typically consists of a number of methods including HTTP compression and connection management/ pooling. Compression can dramatically reduce the size of a typical web page by 70-90%. This means that over a real internet connection i.e. with some latency, the page will be compressed, delivered and uncompressed much faster than a page without [...]
What is SSL acceleration and off load in Load balancing
SSL acceleration or SSL offload is the ability for a load balancer to establish a secure tunnel with the client thus in most cases replacing the requirement for the web server to perform SSL. In order for the load balancer to perform this function it must be configured with an SSL certificate either self generated [...]
What is server health checking in load balancer
Server health checking is the ability of the load balancer to run a test against the servers to determine if they are providing service. Ping:Â This is the most simple method, however it is not very reliable as the server can be up whilst the web service could be down. TCP connect:Â This is a more [...]
What are load balancing methods
Typically a load balancing method or strategy is used to decide how the load balancer chooses where to send the request. There are many strategies available depending on the vendor, however a few common ones are listed below: Round robin: The most  simple method, each server takes a turn. Least number of connections: The load balancer will [...]
What is a Hardware load balancer?
A hardware load-balancing device (HLD), also known as a layer 4-7 router, is a physical unit that directs computers to individual servers in a network, based on factors such as server processor utilization, the number of connections to a server, or the overall server performance In networking, load balancing is a technique to distribute workload [...]
How to Configure Rate Limiting in NetScaler
What are the Rate Limiting factors for the high performance NetScaler MPX appliances? In the high performance NetScaler MPX appliances, such as NetScaler MPX appliance 17500, 19500, and 21500, the following are the parameters that determine the Rate Limit of the appliance: Packets per second Throughput Packet Engines Secure Socket Layer (SSL) chips or cores [...]
How to Configure XPath Injection Prevention feature in NetScaler
It’s important to know that XML is just as susceptible as HTML and other formats to code injection methods. As XML is very generous when it comes to accepting poor typing and XPath parsers are merciful to input data, XML is all the more at risk. As per Wikipedia, injection attacks are “… a technique [...]
How to Recover a Password for a NetScaler Appliance
At times, you might need to recover the password for a NetScaler appliance if the user of the appliance has forgotten the same. To recover the password for the NetScaler appliance, complete the following procedure: Attach a console cable to the Serial Console (9600 baud, 8 bits, 1 stop bit, No parity) of the NetScaler [...]
How to Configure the Direct Server Return (DSR) Feature on the NetScaler Appliance
To configure the Direct Server Return (DSR) feature on the NetScaler appliance, complete the following procedure from the command line interface of the appliance: Run the following command to enable the MBF (Mac Based Forwarding) mode: enable ns mode mbf Run the following command to create the service: add service <Service_Name> <IP_Address> ANY * -usip [...]
Hotfix Rollup Pack 6 for Citrix XenApp 5.0 and Citrix Presentation Server 4.5 for Microsoft Windows Server 2003 32-bit Edition
Hotfix readme name:Â PSE450W2K3R06.HTML Hotfix package name:Â PSE450W2K3R06.MSP For: Computers running Windows Server 2003 (32-bit) with one of the following installed: XenApp 5 Feature Pack 2 XenApp 5 Presentation Server 4.5 Feature Pack 1 Presentation Server 4.5 XenApp Fundamentals 2.0 Replaces: PSE450W2K3R01, PSE450W2K3R02, PSE450W2K3R03, PSE450W2K3R04, PSE450W2K3R05, PSE450R03W2K3069, PSE450R03W2K3070, PSE450R04W2K3031, PSE450R04W2K3032, PSE450R04W2K3033, PSE450R04W2K3034, PSE450R04W2K3035, PSE450R04W2K3036, PSE450R04W2K3037, PSE450R04W2K3038, PSE450R04W2K3039, [...]
How to Get TWAIN to Work in XenApp 5.0 for Windows 2008 32-bit or 64bit
By default in Windows 2008 the twain_32.dll is not in the same directory of past Windows Operating Systems which was (C:\Windows). So when an application makes a call for twain_32.dll it is unable to find the file and in turn unable to find any scanners attached to the clients machine. Resolution For Windows 2008 32bit [...]
How to troubleshoot the TWAIN redirection functionality with XenAp
TWAIN troubleshooting can be divided into two sections: Acquiring the scanner through an ICA session Acquiring the image through the scanning process. Section 1: Acquiring the scanner through an ICA session Ensure that the server edition is set to Advanced or higher. Ensure that the server version is set to 4.0 or higher. Ensure that [...]
How to Enable or Disable Web Server Logging in NetScaler
You can set parameters to enable web server logging and to modify the size of the buffer that stores the logged information. You can display these settings at any time. Use either of the following procedures to enable or disable web server logging. To enable or disable web server logging using Configuration Utility 1. In [...]