Session Hosts Hanging Frequently

Robin_Kinetix 

We were never able to figure out a proper solution despite months of back and forth with MS Support.

I ended up creating a scheduled task to reboot on the hosts every 8 hours (if nobody is logged in) which has reduced the frequency of the hangs from once every few days to once every few weeks/months.

Here's the Powershell script that is called by the scheduled task - it runs every 5 minutes.

$minHoursBetweenReboots = 8 # Minimum number of hours between reboots

function Write-Log($logMessage)
{
    $logFile = "$($PSScriptRoot)\ScheduledRestart.log"
    Write-Output "[LOG] [$(Get-Date -Format "yyyy-MM-dd HH:mm:ss")] $logMessage"
    Write-Output "[LOG] [$(Get-Date -Format "yyyy-MM-dd HH:mm:ss")] $logMessage" | Out-File $logFile -Append
}

Write-Log "Start of script"

function End-Script
{
    Write-Log "End of script"
    exit 0
}

# Check for running installations. If any, then exit
if((Get-Process).Name -match "msiexec|setup|wusa")
{
    Write-Output "Detected software installation in progress. Exiting..."
    End-Script
}

# Check for active sessions. If any, then exit
[array]$activeSessions = & query session | Select-String -SimpleMatch "Active"
if($activeSessions.Count -gt 0)
{
    Write-Log "There are $($activeSessions.Count) active sessions. Exiting..."
    End-Script
}
else
{
    Write-Log "There are no active sessions"
}

# Get last boot time
try
{
    $osInfo = Get-WmiObject -Class Win32_OperatingSystem
    [datetime]$lastBootTime = $osInfo.ConvertToDateTime($osInfo.LastBootUpTime)
    Write-Log "Last boot time: $lastBootTime"
}
catch
{
    Write-Log "ERROR: Unable to get last boot time. Exiting..."
    End-Script
}

# If more than $minHoursBetweenReboots since last boot time then reboot
if($lastBootTime -lt (Get-Date).AddHours(-$minHoursBetweenReboots))
{
    Write-Log "Last boot time was more than $minHoursBetweenReboots hours ago. Restarting..."
    & shutdown -r -t 0 -f -c "Restart initiated by scheduled task/powershell script"
}
else
{
    Write-Log "Last boot time was less than $minHoursBetweenReboots hours ago. Exiting..."
    End-Script
}
End-Script