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Load balancing Windows Terminal Server – HAProxy and RDP Cookies or Microsoft...
When you have users depending on Windows Terminal Services for their main desktop, it’s a good idea to have more than one Terminal Server. RDP, however, is not an easy protocol to load balance;...
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EC2 load balancer appliance rocks, and its FREE… for now anyway.
Update: Sorry but as of Wednesday 6th Oct 2010, the free lifetime license is no longer available! OK, so let me begin by saying that I am both excited and slightly scared by our latest product. I’m...
View ArticleG-Zip Compression and Loadbalancing
A couple of our customers have asked if our appliances would do G-Zip compression in the past we haven’t given it much thought. Then out of the blue a company offered us a card to test with...
View ArticleIIS and X-Forwarded-For Header
So, you’re using IIS and you want to track your clients by IP address in your IIS logs. Unfortunately, out of the tin, this is not directly supported. The X-Forwarded-For (XFF) HTTP header is an...
View ArticleApache and X-Forwarded-For Headers
As a follow on to my previous blog, its easier to get Apache to log client IP addresses utilizing X-Forwarded-For headers than it is using IIS. By default, the logs do not record source IP addresses...
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Load Balancing Exchange 2010 CAS Array with HAProxy (Quick Guide)
This Blog is for anyone wanting to load balance the Exchange 2010 CAS role using only open source software. In my example I will be starting with a simple Debian net-install and building the HAProxy...
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Setting up HAProxy with Transparent Mode on Centos 6.x
Transparent mode with HAProxy allows you to see the IP Address of the clients computer while still having a high availability service using HAProxy. This posting shows how to setup a blank virgin...
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HAProxy Email Alerts Guide
In this guide I show a very simple solution to get HAProxy email alerts configured using Logwatch. While the first part is aimed at users of our V7 appliance I think anyone wanting to get email alerts...
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Microsoft drops support for mstshash cookies?
Recently we have seen quite a few customer issues where using RDP cookies (mstshash cookies see - http://www.snakelegs.org for more details) seems to result in multiple active sessions over several RDP...
View ArticleMicrosoft drops support for mstshash cookies confirmed
Well it looks like Microsoft have indeed silently dropped support for mstshash cookies for load balancing as suspected in my last post. As detailed in the last post we had a call open with Microsoft...
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What do you mean my pipe is saturated?
Some of the most common questions we get at Loadbalancer.org are performance related. It is quite difficult to give a straight answer to these questions as the real answer is the slightly...
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Open Source Windows service for reporting server load back to HAProxy (load...
In general when you are load balancing a cluster you can evenly spread the connections through the cluster and you get pretty consistent and even load balancing. However with some applications such as...
View Article3 Ways To Send HAProxy Health Check Email Alerts
To follow up to Aarons blog on HAProxy emails alerts using logwatch I was looking into different ways to achieve the same results. Now the ideal way to monitor the health of the real servers is to to...
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Source IP Addresses, STunnel, Haproxy and Server Logs
When using proxies such as STunnel and HAProxy it’s easy to loose track of the client source IP address. This occurs for example when HAProxy is used in it’s default configuration to load balance a...
View ArticleSimple Denial of Service DOS attack mitigation using HAProxy
Denial of Service (DOS) attacks can be especially effective against certain types of web application. If the application is highly dynamic or database intensive it can be remarkably simple to degrade...
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Transparent Load balancing with HAProxy on Amazon EC2
This is a quick guide on how to setup transparent mode on HAProxy in Amazon’s EC2. One of our favoured methods of load balancing is using Layer 4 DR because it is transparent and fast. Unfortunately...
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Blocking invalid range headers using ModSecurity and/or HAProxy (MS15-034 –...
Microsoft quietly patched a fairly nasty little bug (MS15-034) in IIS last month: A simple HTTP request with an invalid range header field value to either kill IIS, reveal data or remotely execute...
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