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Question
Tuesday, September 18, 2012 3:25 AM
Hello
a few months back, I installed and configured Windows NLB on a couple of exchange CAS servers and everything seems to be working fine (still working fine). However, the other day when I opened NLB manger on each servers to find that one of the HOST is missing from the cluster.* *If I open NLB on server1, Server2 is not listed and viceversa. I tried to refresh the screen to no avail. I tried to re-add the missing host on to the cluster I get " The specified host is already part of this cluster". NLB is running in multicasrt mode seems to be working fine, i just cant see both servers. Is there any way I can rectify this?
I am running windows 2008R2 Sp1. (it could see it fine in the past not now)
hakim
All replies (13)
Tuesday, September 18, 2012 6:36 PM âś…Answered
At this point I am just poking around. Never heared anyone complaining about this before.
Can you please check if you can query WMI is reachable across machines? You can use this VB script,
http://msdn.microsoft.com/en-us/library/windows/desktop/bb736301(v=vs.85).aspx
Here is how you can specify a remote machine
http://msdn.microsoft.com/en-us/library/windows/desktop/aa370986(v=vs.85).aspx
Few things to check:
- Does the user that you are running as on the node1 have enough permissions to talk to the NLB WMI provider on the other node? I think it have to be an admin. To verify you can check if you can access \<nother node name>\c$ on the remote machine.
- Is it possible that there are some firewall rules that shut down RPC/WMI traffic across the machines? You can try to look at the firewall traces to see if it drops attempts to connect to certain ports.
Regards, Vladimir Petter, Microsoft Corporation
Tuesday, September 18, 2012 4:48 AM
Are nlb.exe and NLB power shell comandlets working?
Regards, Vladimir Petter, Microsoft Corporation
Tuesday, September 18, 2012 6:28 AM
Are nlb.exe and NLB power shell comandlets working?
Regards, Vladimir Petter, Microsoft Corporation
Yes Vladmir, the do both work fine. I just cant see both servers in NLB manager. :(
Tuesday, September 18, 2012 6:34 AM
NLB manager uses WMI provider to talk to each machine. NLB power shell does the same. One thought would be that a firewall blocking something. Can you check if NLB power shell is able to to manage one machine from another?
Regards, Vladimir Petter, Microsoft Corporation
Tuesday, September 18, 2012 6:46 AM
NLB manager uses WMI provider to talk to each machine. NLB power shell does the same. One thought would be that a firewall blocking something. Can you check if NLB power shell is able to to manage one machine from another?
Regards, Vladimir Petter, Microsoft Corporation
Hi Vladimir, what command should I run for listing both servers ? I run "nlb display all" gives information about the parameter of the cluster.
Tuesday, September 18, 2012 7:17 AM
You can try power shell Get-NLBClusterNode | fl *
These blog posts have more on NLB power shell
http://blogs.msdn.com/b/clustering/archive/2009/10/28/9913877.aspx
http://blogs.msdn.com/b/clustering/archive/2009/11/24/9927791.aspx
http://blogs.msdn.com/b/clustering/archive/2008/12/26/9253786.aspx
http://technet.microsoft.com/en-us/library/ee817138.aspx
Regards, Vladimir Petter, Microsoft Corporation
Tuesday, September 18, 2012 7:46 AM
hi Vladmir the command Get-NLBClusterNode lists only the node1 that I am running the command on.
If I run the same command on the other node2, it shows only Node 2
Friday, February 8, 2013 4:32 PM
On the host that doesn't show all nodes, open the Network Load Balancing Manager, select the menu item Cluster > Connect to Existing > then select the missing host.
Tuesday, July 30, 2013 9:48 PM
It works, but when I close and open the NLB manager I have to do the same again to fix it because the host always disappear. Any ideas??
Tuesday, February 11, 2014 2:44 PM
I had the same problem. The issue was that I was viewing the NLB cluster from one of the hosts. Open NLB Manager from another server that is not a host and you should be able to see all of the host's in the cluster.
Thursday, August 6, 2015 6:28 PM
In NLB Manager, add the other hosts by connecting to cluster and choose the host that is missing. NLB Manager will place it under the NLB you are connecting to.
Save the NLB connections as a text file so you can open all of them the next time you are in NLB Manager
Friday, April 21, 2017 5:35 AM
Hi,
I am facing the same issue. Is this by design, or some issue with the NLB cluster?
Is there any fix for it? Please advise.
Wednesday, February 5, 2020 8:51 AM
I'm facing the same issue too.
Two nodes, Node 1 and Node 2, are only visible to themselves - Node 1 NLB Manager only seeing Node1 connected to cluster and vice versa. Both nodes are connected to the same cluster.
Anyone has any solution to this? Tried to re-configure but still getting the same results.