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NLB - Session Host Configuration


We recently purchased a Barracuda LB 340Vx for our terminal server load balancing.

I have configured the unit based on the guidelines provided in this link.

The load balancing feature is working as it should, however there is a quirky problem I am seeing upon initial connection. When I enter the Virtual IP address for the LB, it directs me to a server in the farm, then redirect's me again to another farm server before allowing me to log on.

Once I get logged on, I can reconnect with the same user from another machine and reopen the same session, as intended.


- Open mstsc.exe
- Connect to : x.x.x.x
- Shows connecting to Srvr1. Accept unregistered cert.
- Now points me to Srvr2 or Srvr3, accept again and we connect to the second server.

Any help that can be provided would be great.

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So, what you mean is you are connecting to LB VIP and redirected to one server and actually get connected to another server ?

Have you configured session directory server in your environment ?
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Correct. Its seems to be functioning as intended, since the LB is assigning sessions to each server accordingly. The cert acceptance screen was triggering twice for each server after it redirected a second time.

After further investigation, I noticed this was happening when it tried to hit a server with more current sessions then another.

I was able to get around this prompt by going into the settings for Remote Desktop and changing the advanced value under server authentication to "Connect and don't warn me".

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Mahesh, thank you for your assistance. All is working well now. :)

(And yes, I have already assigned a static entry in DNS for the VIP)