Remotely log off all disconnected sessions from a server, RDP session hosts or otherwise.

Invoke-DisconnectedRDPSessionLogOff.ps1

$server   = ''
$sessions = quser /server:$server | where-object { $_ -match "Disc" }
Foreach ($Session in $Sessions)
{
    $UserName = $Session.split(' +')[1]
    
    $ID = qwinsta /server:$server $UserName | where-object { $_ -match $UserName } | Where { $_ -ne "" } | ForEach { $_.Replace(" ","") } | ForEach { $_.Replace("Disc","") } | ForEach { $_.ToLower() } | ForEach { $_.Replace("$UserName","") } 
    Write-Output "SessionID $ID Username: $UserName is disconnected"
    logoff $ID  /server:$server 
}