Disable ICA Load Evaluator

How to Take a XenApp Server Offline with Load Evaluator and Powershell 

Requirements: XenApp 4.5 or 5.0 with Hotfix Rollup Pack 06

Procedure : 

•  In the XenApp Advanced Configuration console, right click the Load EvaluatorsNew Load Evaluator. node and select

Name your load evaluator and assign Scheduling as the only rule.

Remove all intervals from the scheduling rule. This prevents any server with this assigned rule from taking any connections.

•  Once you have the offline Load evaluator created, you can use PowerShell ian a script or command line to take the server offline using the following PowerShell command:
  Set-XAServerLoadEvaluator [ServerNAme] [LoadEvaluatorName] 
• To reset the server to the default load evaluator, use the following PowerShell command.
  Reset-XAServerLoadEvaluator [ServerName]

Create the above Load Evaluator useing the below powershell script . Run the script useing ./Add-DisableICALogonLE.ps1 -name [Load_EvaluatorName]

"
# NAME
#     Add-DisableICALogonLE.ps1
#
# SYNOPSIS
#     Creates a Load Evaluator with an empty Schedule Rule.
#
# SYNTAX
#     .\Add-DisableICALogonLE.ps1 -name Name [-description Description]
#
# DETAILED DESCRIPTION
#     A Load Evaluator with an empty Schedule Rule will maximize a XenApp
#     server's load. Thus, it won't accept new ICA sessions while active
#     and disconnected sessions are not affected.
#
# AUTHOR
#     Frank-Peter Schultze http://www.fpschultze.de/
#
# DATE
#     27-Jul-2008
Param(
  $name = $(throw "Load Evaluator name must be specified"),
  $description = "Takes server offline for maintenance purposes"
)
$MetaFrameWinFarmObject = 1
$LMRuleSchedule = 5
$myfarm = New-Object -ComObject "MetaFrameCOM.MetaFrameFarm"
$myfarm.Initialize($MetaFrameWinFarmObject)
$myfarm.LoadEvaluators | %{if ($_.LEName -eq $name) {
    Write-Warning "The load evaluator `"$name`" already exists."; break
  }
}
Write-Verbose "Creating Load Evaluator `"$name`" . . ."
$newrule = New-Object -ComObject "MetaFrameCOM.MetaFrameLMRule"
$newrule.RuleType = $LMRuleSchedule
$allrules = New-Object -ComObject "MetaFrameCOM.MetaFrameLMRules"
$allrules.AddRule($newrule)
$newle = New-Object -ComObject "MetaFrameCOM.MetaFrameLoadEvaluator"
$newle.LEName = $name
$newle.Description = $description
$newle.Rules = $allrules
$newle.SaveData()
"