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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Microsoft NLB across subnets

When putting two servers in a MS Network Load Balancing Cluster, can the two servers be on different subnets? For example... Host A - 10.10.1.1\255.255.255.0 Host B - ...
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Haproxy routing one Frontend to multiple backend with subdir [closed]

im trying to setting up my NLB Haproxy service to balance multiple Application hosted on different subdir of the same domain. I need backend(s) with subdir serving one frontend... here my full ...
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73 views

Windows Service Bus and Network Load Balancing

I'm looking to build an HA service bus farm, hopefully using Microsoft NLB on Windows Server 2012 R2, something like what is described here. In the output below 9354 belongs to ...
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24 views

NLB heartbeat failing with Windows Authentication enabled on IIS

I have the following setup: 1) Several IIS instances running ASP.NET sites 2) Sites use Windows Authentication 3) NLB device is used to balance traffic between instances 4) HTTPS is terminated on ...
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71 views

NLB cluster []: Timer starvation has been detected. This

we have two node NLB cluster basicly for http reguests. Server system logs have theese warnings: NLB cluster []: Timer starvation has been detected. This might be due to a denial of service attack or ...
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106 views

Windows Server NLB vs hardware-based NLB [closed]

Can somebody with extensive experience explain me what are the selling points of hardware-based NLB over Windows NLB and what are major/main disadvantages of Windows NLB? I recently read through some ...
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1answer
168 views

Windows Server 2012 NLB logging

Can somebody clarify to me what are the best practices when it comes to configuring logging and monitoring for Windows Server 2012 NLB. I believe there are 2 types of logging from management service ...
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55 views

IP configuration for NLB / ARR servers in front of IIS web servers

Currently, I have 3 websites on a single IIS web server. I use 3 dedicated IPs (one per site) because the sites use either SSL or wildcard subdomains. Now, I want to make this environment highly ...
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25 views

NLB - detect service down

I am trying to work out how to use PowerShell to detect when a load balanced (NLB) Apache service is no longer accepting requests (but the service is still running). Windows NLB detect dead IIS? ...
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1answer
487 views

One Network Load Balancing host can't see the other

We have setup a Windows Network Load Balancing (NLB) cluster of 2 hosts for our new staging environment. The cluster initially works fine, but eventually, after stopping and starting one of the hosts ...
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231 views

Microsoft Network Load Balancing - Hosts Won't Converge Simultaneously

I am running Network Load Balancing on two Windows Server 2012 R2 Datacenter VMs in a VMWare ESXi Host environment. The cluster and hosts are configured to use multicast and all are on the same VLAN ...
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2answers
272 views

Windows Server 2008 NLB doesn't respond to ARP request

I have two instances of Windows Server 2008 running in Hyper-V VM's. The two instances are configured in a multicast NLB. I can ping either node from another subnet, but I get a timeout when pinging ...
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106 views

ARR Load Balance with two Machines - Always redirect to same Site

described steps for each setup. Created a sample Application WebShareTest , hosted the application in M1(IP 36) on port (80) and same Binary I hosted in M2(IP 210) (on port 8070) I pointed some ...
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35 views

Load balance 2 wireless adapters on 2 different computers (ie. w/NLB)

I have 2 physical servers running 2012R2. Each box has its own wireless nic. I also have 1 SSID to which both servers/WLANs connect to. While trying to setup NLB, I noticed the Wireless NICs didn't ...
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1answer
119 views

Network Load Balancing VMWARE [closed]

Is network load balancing (NLB) with windows server 2012 using unicast and active-passive mode supported on VMWARE ? More details: I have 3 http servers running inside a windows server 2012 ...
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2answers
293 views

Does Windows Network Load Balancing require any specific ports to be open?

I have two Windows 2012 servers, joined in a Windows Network Load Balancing cluster. I have been trying to find how the NLB heartbeat message is exchanged between those servers (to make sure it will ...
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1answer
339 views

Windows multicast NLB with Linux clients

I'm (on behalf of a client, anyway) having some troubles with Linux accessing a multicast NLB cluster hosted on Hyper-V (waiting for more information on what version, but I don't think the version is ...
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1answer
104 views

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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1answer
419 views

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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1answer
534 views

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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2answers
637 views

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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199 views

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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1answer
682 views

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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1answer
104 views

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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1answer
82 views

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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1answer
471 views

Setting up NLB in a VLAN

I have a network layout like this (ESXi hosts): Internal Network + +-----------------+ ...
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1k views

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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49 views

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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1answer
2k views

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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420 views

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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1answer
562 views

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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1answer
367 views

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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1answer
98 views

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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1answer
466 views

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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1k views

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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1answer
584 views

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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1answer
834 views

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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654 views

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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108 views

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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1answer
226 views

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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261 views

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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0answers
396 views

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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3answers
1k views

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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2answers
1k views

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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1answer
494 views

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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3answers
2k views

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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1answer
2k views

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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1answer
935 views

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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1answer
75 views

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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1answer
144 views

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 ...