Error Network Load Balancing
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Network Load Balancing Windows 2008 R2
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Network Load Balancing Windows 7
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Microsoft Network Load Balancing 2008 R2
and Embedded Development .NET Development Office development Online Services Open Specifications patterns & practices Servers and Enterprise Development Speech Technologies Web Development Windows Desktop App Development TOC Collapse the table of content Expand https://technet.microsoft.com/en-us/library/cc732592(v=ws.11).aspx the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. Network Load Balancing Technical Overview Operating System Abstract Network Load Balancing, a clustering technology included in the Microsoft Windows 2000 Advanced Server and Datacenter Server operating systems, enhances the scalability and availability of mission-critical, TCP/IP-based services, such as Web, Terminal Services, virtual private networking, https://msdn.microsoft.com/en-us/library/bb742455.aspx and streaming media servers. This component runs within cluster hosts as part of the Windows 2000 operating system and requires no dedicated hardware support. To scale performance, Network Load Balancing distributes IP traffic across multiple cluster hosts. It also ensures high availability by detecting host failures and automatically redistributing traffic to the surviving hosts. Network Load Balancing provides remote controllability and supports rolling upgrades from the Windows NT 4.0 operating system. The unique and fully distributed architecture of Network Load Balancing enables it to deliver very high performance and failover protection, especially in comparison with dispatcher-based load balancers. This white paper describes the key features of this technology and explores its internal architecture and performance characteristics in detail. On This Page Introduction Network Load Balancing Architecture Network Load Balancing Performance Summary Glossary of Key Terms Introduction Internet server programs supporting mission-critical applications such as financial transactions, database access, corporate intranets, and other key functions must run 24 hours a day, seven days a week. And networks need the ability to scale performance to handle large volumes of client requests without creating unwanted delays. For these reasons, clustering is of wide interest to the enterprise. Clust
complex routing protocols like BGP. This capability balances network sessions like Web, email, etc. over multiple connections in order to spread out the amount of bandwidth used by each LAN user, thus increasing the https://en.wikipedia.org/wiki/Network_Load_Balancing total amount of bandwidth available. For example, a user has a single WAN connection http://serverfault.com/questions/149881/nlb-accessed-denied-from-second-server to the Internet operating at 1.5Mbit/s. They wish to add a second broadband (cable, DSL, wireless, etc.) connection operating at 2.5Mbit/s. This would provide them with a total of 4Mbit/s of bandwidth when balancing sessions. Session balancing does just that, it balances sessions across each WAN link. When Web browsers connect to the Internet, they network load commonly open multiple sessions, one for the text, another for an image, another for some other image, etc. Each of these sessions can be balanced across the available connections. An FTP application only uses a single session so it is not balanced; however if a secondary FTP connection is made, then it may be balanced so that on the whole, traffic is evenly distributed across the various connections network load balancing and thus provides an overall increase in throughput. Additionally, network load balancing is commonly used to provide network redundancy so that in the event of a WAN link outage, access to network resources is still available via the secondary link(s). Redundancy is a key requirement for business continuity plans and generally used in conjunction with critical applications like VPNs and VoIP. Finally, most network load balancing systems also incorporate the ability to balance both outbound and inbound traffic. Inbound load balancing is generally performed via dynamic DNS which can either be built into the system, or provided by an external service or system. Having the dynamic DNS service within the system is generally thought to be better from a cost savings and overall control point of view. Contents 1 Microsoft NLB 1.1 Unicast mode 1.2 Multicast mode 2 Server load balancing 3 See also 4 References Microsoft NLB[edit] Microsoft has also purchased[1] a technology that it renamed Network Load Balancing (NLB) that allows for efficient utilization of multiple network cards. MS NLB can be configured in unicast or in multicast mode[2] where in multicast mode you can enable IGMP snooping. MS NLB was introduced for the first time in Windows NT server to sprea
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top NLB Accessed Denied from second server up vote 0 down vote favorite 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 NLB Manager, it only shows web2 and says in the log "Accessed Denied. Error connecting to web1". Any ideas how to fix? windows windows-server-2008 cluster nlb mirroring share|improve this question asked Jun 10 '10 at 0:12 Igor K add a comment| 3 Answers 3 active oldest votes up vote 1 down vote Often the NLB manager doesn't refresh it's view so the access denied error message may be stale. Try restarting it. Another thing to check is the cluster type (unicast or multicast) and which adaptor you are connecting to as part of the cluster. If you have picked the cluster address on one side and not the other it may appear to be working, it just depends on whether the request was redirected to the correct machine at the time the request was made. share|improve this answer answered May 13 '11 at 16:50 David Newcomb 203410 add a comment| up vote 0 down vote I have faced this issue multiple times and what i have seen as a simple solution is - the DNS resolution fails in most cases and thus the error. a work around can be - include the IP address, alias and the hostname of the machine you are adding in your cluster. HOST file is ideally in the following location of your windows 2008 server - C:\Windows\System32\drivers\etc\" -Djay. share|improve this answer answered Feb 8 '13 at 10:15 user158128 1 add a comment| up vote -1 down vote MAke sure you use the same password on both for setting up NLB. share|improve this answer answered Jun 10 '10 at 0:49 ggonsalv 350112 Isn't it bad practice to have the same password for two administrator accounts on different machines? &ndas