App-v 4.6 generates sometime a large sftfs.fsd file. Users are experiencing performance issues when the file exceeds 15 GB. To fix this problem administrators remove the file by rebooting the Xenapp in safe mode. No user should be logged in of course. The Citrix servers therefore need to be empty. My colleagues ran a VB script that did the job of detecting but nothing else. I have made a script in Powershell that does the same but also set the server in ProhibitLogOns logon mode. The implement this script the server must have the Xenapp SDK installed. The server which runs the script need to have relay rights on the SMTP server. You’ll also need to have a Xenapp Server with PSRemoting enabled or the server itself should be member of the Xenapp farm.

#Load Modules and Snapins
Import-Module ActiveDirectory
Add-PSSnapin Citrix*
#Opens array for servers that apply on the conditions specified below
$ProhibitLogonServers =@()
$SMTP = "SMTPSERVER"
#Get all Xenapp server based on OU
$list = Get-ADComputer -Filter * -SearchBase "OU=Citrix Servers,OU=Servers,DC=Domain,DC=LOCAL"
Foreach ($Computer in $List){$Server = $Computer.DNSHostName 
$Result = GI "\\$Server\d$\AppVClientcache\Global\SoftGrid Client\sftfs.fsd"
If ($result.length -ne 0){$Outinfo = $Server+";"+$Result.length+" Bytes"
AC -Value $Outinfo -Path ".\log.csv"
#The conditions are met if the file is greater and engels 15 GB
If (($Result.length / 1073741824 ) -ge 15){$ProhibitLogonServers += $Computer}}}

#Mail message if no server are found                                                                                                                                                                            
If ($ProhibitLogonServers.length -eq 0){
$Mail = "Er is geen server gevonden die voldoet aan de voorwaarden om op ProhibitLogons te worden gezet" + "`n`n" + "Met Vriendelijke groet," +  "`n" + "Ochtend Controle Script"
Send-MailMessage -From "SendingAddress" -Subject "Prohibitlogons Report" -To "DestinationAddress" -Body $mail -SmtpServer $SMTP}

#Mail message one server is found
If ($ProhibitLogonServers.count -eq 1){
$Mail = "Er is een server gevonden die voldoet aan de voorwaarden om op ProhibitLogons te worden gezet. De server heeft als naam:" + "`n`n" + "$ProhibitlogonServers.Name" +"`n`n"+ "Met vriendelijke groet," + "`n`n" + "Ochtendcontrole Script"
Send-MailMessage -From "SendingAddress" -Subject "Prohibitlogons Report" -To "DestinationAddress" -Body $mail -SmtpServer $SMTP}

#Mail message if more than one server is found
If ($ProhibitLogonServers.count -gt 1){
$Mail = "Er zijn servers gevonden die voldoen aan de voorwaarden om op ProhibitLogons te worden gezet. De servers hebben de naam:" + "`n`n"
foreach ($server in $prohibitlogonservers){$Mail = $Mail + $Server.Name + "`r`n"}
$Mail = $Mail  + "`n" + "Met vriendelijke groet," + "`n`n" + "Ochtend Controle Script"
Send-MailMessage -From "SendingAddress" -Subject "Prohibitlogons Report" -To "DestinationAddress" -Body $mail -SmtpServer $SMTP}

#Opens array to check if the server has been set to prohibit logons. If servers are found a retry will be executed
$FailedServers = @()
If ($Prohibitlogonservers -ne $null){
Foreach ($Server in $Prohibitlogonservers){Set-XAServerLogOnMode -ServerName $Server.Name -LogOnMode Prohibitlogons -ComputerName CitrixServer}
Foreach ($Server in $Prohibitlogonservers){If ((Get-XAServer -ServerName $Server.Name -ComputerName CitrixServer).LogonMode -notmatch "ProhibitLogonOns"){$FailedServers += $Server}}}

#If a server is rebooting during the process you do want to make sure that server is set to Prohibit Logons. 
Start-sleep -s 900

#Retry setting the server to prohibit logons
If ($Failedservers.count -ne 0){
Foreach ($Server in $FailedServers){Set-XAServerLogOnMode -ServerName $Server.Name -LogOnMode Prohibitlogons -ComputerName CitrixServer}
$Failedservers = @()
Foreach ($Server in $FailedServers){If ((Get-XAServer -ServerName $Server.Name -ComputerName CitrixServer).LogonMode -notmatch "ProhibitLogonOns"){$FailedServers += $Server}}}

#Mail message if servers aren't set to prohibit logons
If ($Failedservers.count -ne 0){$Mail = "Er zijn servers niet succesvol op prohibitlogons gezet. Deze servers zijn:" + "`n`n"
foreach ($server in $Failedservers){$Mail = $Mail + $Server.Name + "`r`n"}
$Mail = $Mail  + "`n" +'Zet deze server(s) handmatig op ProhibitLogons' + "`n`n" + "Met vriendelijke groet," + "`n`n" + "Ochtend Controle Script"
Send-MailMessage -From "SendingAddress" -Subject "Prohibitlogons Failed" -To "DestinationAddress" -Body $mail -SmtpServer $SMTP}