Network Load Balancing (NLB) is a component in Windows Server operating systems that load balances network traffic (sent to a cluster virtual IP address) among multiple servers in an NLB cluster.

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Setting up Multicast NLB Cluster with HP 6120XG Switch

How can I setup an NLB cluster across 2 blades connected via a HP 6120XG Switch? All of the guides are for Cisco and setup static ARP entries on the switch but that is not possible on the HP Switch. ...
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Stop single NLB node at command line

We have a NLB cluster set up for our public web servers. I'm trying to stop the "localhost" in the cluster from the command line using NLB.EXE. When I write "nbl stop" it seems that all nodes are ...
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Windows Remote Desktop Cluster - can we force some users to a specific server?

Given an RDS cluster with NLB, users connect and login to one of the servers at random. But there is one program that's only available on one of the servers (licensing reasons). Can we force a group ...
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Linux equivalent of Windows NLB

With Windows, we can setup load balancing for arbitrary IP services just by installing NLB and selecting which nodes we want in the cluster. It does some MAC address changing, then has algorithms to ...
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NLB for incoming SMTP connections from a single server

We have 2 Exchange CAS servers running NLB. We use an outsourced SPAM provider who forwards messages to us. All of the messages from them go to a single CAS server because we only see one IP address ...
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How do I know which node in a cluster answers?

I have set up an NLB with two servers (nodes) which are running the same service. The filtering is single host, because I don’t want them to run at the same time, because there is data in the cache ...
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NLB/DFS between servers at different locations?

I currently run a web application on a single VPS but have the need to make it redundant so that the website will not become unavailable in case the server goes down for any reason. I have found that ...
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NLB ARR cross-node setup

Given: one ASP.NET web application 2 Windows servers with IIS installed (no more servers allowed) I want to enable load balancing / failover for that application, on both server and application ...
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NLB Accessed Denied from second server

Have NLB set up and working. Just two servers, web1 and web2. I set up NLB on web1 and can view both machines as Converged. (I had to specify a login/pass to connect to web2). On web2, looking at the ...
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How to synchronize applications between two terminal-service servers?

We have two terminal-service server and we use Network Load Balancing (NLB) to cluster this two terminal-service servers together. We need to have the same applications installed on the two servers, ...
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Two NLB mutlicast clusters on the same VLAN processing same traffic

I have an older ISA2006 based NLB cluster which I plan to migrate to a new TMG2010 NLB cluster. I need to have both clusters active for some time during migration (with different IPs of course). Both ...
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Drainstopping NLB via powershell remotely

This question was asked by a colleague on SO here, though it was suggested that we ask it here instead - apologies for the cross posting. Server is Windows Server 2008 R2 - UAC is disabled on the ...
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NLB - Stop IIS Site 1 - Will it now alway go to IIS Site 2?

With Windows Network Load Balancer (nlb) if I turn OFF a single IIS Site on Box 1 Will traffic be automatically redirected to the same corresponding site on Box 2? Thanks
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How do you setup FTP with IIS Manager Users in an NLB environment with shared IIS configs?

I've setup a 2 node NLB cluster and used the following to share IIS configs between them. http://blogs.technet.com/b/meamcs/archive/2012/05/30/configuring-iis-7-5-shared-configuration.aspx The IIS ...
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Is there a primary webserver in a NLB scenario?

I help administer a small NLB that points to two Windows Servers running IIS which share a configuration. The sites' flat files are replicated using DFSR. I get the gist of how this all works from ...
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Could SQL Server 2008 replication be used with NLB to allow unlimited scaling of reporting servers?

We are currently using transactional replication in SQL Server 2008 to keep a secondary reporting server synchronized with a primary database server. This has been working weel and keeps some of the ...
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Setting up NLB in a VLAN

I have a network layout like this (ESXi hosts): Internal Network + +-----------------+ ...
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Network Load Balancing Manager failover

I would like to be notified when one of my clusters in Network Load Balancing Manager starts up or fails. The documentation seems to infer that there are no advanced scripting, logging, or ...
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Windows Network Load Balancing on ESX Cluster with Dell PowerConnect stacks

We recently switched out our Cisco 6500 core switch for a pair of Dell PowerConnect 6248 stacks. Since then, our Network Load Balanced Sharepoint, which runs on two virtual machines on an ESX cluster ...
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how to install 2 simple ssl certificates on 2 web site having the same ip, in iis8?

how to add a second ssl certificate to the same server for two different web sites?. How to setup a second ip for the second web site considering that the server is balanced? more information: i've ...
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Misunderstanding about packet travel over NLB-Network

I'm doing a LAB about NLB(Network load balancing) on Windows Server 2008 - Unicast mode. But I can't understand how the packet travel across the Network... ...
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How Application Request Routing(ARR) will work with IIS Web Services

I currently have 2 servers on Which nlb and application pools are running .Since the nlb doesn't recognize, that if an application pool has failed, it sends the request even when an application pool ...
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What is the easiest way to obtain a script-driven hot failover system?

I need to reconfigure a prod env to provide hot failover for a db driven web app written in Perl that is currently running on an Apache HTTPD server, on a Linux OS. The app is not designed to run in ...
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Advantage of Microsoft Cluster over Microsoft Network Load Balancer

Till recently, I assumed that Microsoft NLB worked at an OS/Machine level rather than an Application Level. i.e. the NLB just monitors heartbeats on the machine to check if machine is alive and then ...
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MS NLB: why are multicast packets received by all servers on the LAN, not just members of the cluster

I have a MS NLB cluster (Win 2003) which includes just two hosts. The cluster is configured to use Multicast operation mode (not IGMP). For some reason I am seeing packets intended for the NLB ...
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iis 7.5 - WFF and ARR farm management

We have two test web farms (IIS 7.5). The Florida web farm has two ARR servers and two content servers. The ARR servers have WFF and NLB installed. The ARR setup uses a shared config located on a file ...
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How to setup NLB and ARR in server 2008 R2

I'm in charge of deploying a web application. I don't have a hardware load balancer to use. So I thought I could use NLB+ARR. Need to use ARR because my team needs to be able to take one of the 2 ...
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Predictive vs Least Connection Load Balancing Techniques

I have a windows based desktop application that communicates via TCP to the application servers. (windows 2003). No sticky sessions between client calls. We have exactly 2 servers to load balance and ...
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Unreachable Hosts in Windows NLB on VirtualBox [closed]

Setup Cluster : Two Windows Server 2008 R2 nodes. Each running as a VM inside of VirtualBox. Each Node has NLB enabled and a cluster configured. The cluster is configured to use IGMP Multicast. ...
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Load balanced iis 7.5 and one-to-one certificate mapping

I have a scenario where I need to run an application through hardware HTTPS load balancing that does round-robin. Clients will authenticate through pre-issued certificates from a standalone root CA ...
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Sharing Windows 7 NLB in home network [closed]

I have read this question and have been googling trying to do what is in the title, with no luck. I´ve tried bridging connections, ICS, etc. I have two separate internet connections from two ...
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WS2008R2 - Network Load Balancing and IIS - I have no idea

I'd like to avoid discussion of IIS ARR for now - it isn't essential to get NLB working. I have two computers (both in the same domain, btw) who are connected to two networks: A private internal ...
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Network Load Balancing Windows server 2008

I have a questions about load balancing configurations. Maybe someone already asked this question but I didn't find something similar on the web. The Actual Configuration is . I Have two servers ...
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Simple IP load balancer for web service that runs on Windows XP or Windows 7 Professional?

I've a closed code application that needs to connect to a web service that needs to run on XPs or Windows 7 (desktop). The application can only connect to a single IP address. The application is low ...
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Routing dilemma in resilient multi-location web app infrastructure

In need of some help with understanding/resolving a routing challenge we're faced with – here is the scenario/assumptions: A web application is running which is hosted in 2 physical locations, ...
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How to failover to another web service automatically?

I've got a 3rd party off-the-shelf windows application that needs to connect to a Web Service (IP address or URL) installed onto another server (actually running on Windows 7 Professional). My user ...
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NLB RPC server is unavailable on the specified computer

Firstly, I'll admit that my networking knowledge is limited so as people request more information I'll update this question accordingly. I am trying to create a NLB Cluster across 2 Windows Server ...
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Windows Load Balancing over many subnets; how many IP addresses are required

I have two hosts that have an interface in 4 different LAN subnets (no WANs apply here). 10.1.1.x 10.1.2.x 10.1.3.x 10.1.4.x Assume that each subnet will need a local service of x.x.x.9 as the ...
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NLB Node Participating in Cluster But Not Listed in Manager

I have a NLB cluster that has been setup for several months and everything is working as expected. After a reboot of one of the nodes I no longer see that node in the NLB manager. It says it's ...
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windows 7 machines using network load balancing [closed]

I would like to run 2 windows 7 machines in network load balancing mode. If this possible? Searching on the internet, I found a lot of references about 2 internet connections on one computer. That ...
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Can I run two virtual Windows Server 2008 machines in an NLB Cluster all on one Windows 7 box?

I am writing a prototype ASP.NET web application that demonstrates the use of distributed caching for scalability purposes. In order to do this, I would like to set up a couple of load balanced ...
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Windows Server 2008 NLB with VPS

When using network load balancing should I use a public or private IP for the node addresses? The two nodes I will be clustering have both. I have a third public IP that will be the shared IP to the ...
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How to make our web infrastructure more redundant?

We have a single dedicated web server that we pay for monthly from a hosting provider. This server runs Windows Server 2008 Standard Edition with IIS and SQL Server 2008. We have a few websites that ...
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MaxKeepAliveRequests for IIS7 (with NLB)

We have an IIS7 running on several nodes in an NLB cluster. The NLB nodes are set to Affinity:None so that new connections are spread across them. We want KeepAlive switched on so that we can get ...
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How NLB will work with IIS-7 web services?

We'are going to join 2 (two) IIS7 web-servers into NLB with the same web-service published (2 instances of the same web-service one per web-server). Do I understand correctly, that NLB will work for ...
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Communicating from a set of load-balanced Windows servers back to the same set of load-balanced servers

We have a set of load-balanced (using Microsoft NLB v6.1) Windows servers (Windows Server 2008 R2) with IIS7 that host a range of web applications. These web applications do a lot of web service ...
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Unable to access virtual IP after configuring NLB in windows 2008

I have Two webseervers(WS1, WS2). I have added NLB component on both the machines. In WS1, i have added a cluster with IP as (eg:xx.yy.zz.100) and added WS1, WS2 to the same cluster. Now i have ...
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Maximum concurrent connections to a Microsoft NLB Cluster

We recently had a problem with maximum conncurrent connections on a Microsoft NLB cluster, that I got an answer to on stackoverflow: ...
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Network Load Balancing problem

Summary I have two machines in an NLB cluster. If I shut-down one machine (to simulate failure) then the second doesn't take-up the load. I'm looking for help in diagnosing the reason for this. ...