"FullyQualifiedErrorId : -2144108477,PSSessionOpenFailed"

The PowerShell window displayed this error.

VERBOSE: Connecting to E15MB2.exchange2013demo.com.
New-PSSession : [e15mb2.exchange2013demo.com] Processing data from remote server e15mb2.exchange2013demo.com failed
with the following error message: The WinRM Shell client cannot process the request. The shell handle passed to the WSMan Shell function is not valid. The shell handle is valid only when WSManCreateShell function completes successfully. Change the request including a valid shell handle and try again. For more information, see the about_Remote_Troubleshooting Help topic.
At line:1 char:1
+ New-PSSession -ConnectionURI “$connectionUri” -ConfigurationName Microsoft.Excha …
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : OpenError: (System.Manageme….RemoteRunspace:RemoteRunspace) [New-PSSession], PSRemotingTransportException
+ FullyQualifiedErrorId : -2144108212,PSSessionOpenFailed

The cause of this error in my specific case was that the SSL certificate was no longer bound to the Exchange Back End website on that Exchange 2013 server.

To fix this, in IIS Manager right-click the Exchange Back End website and click Bindings.

Highlight https and click Edit.

If you see “Not selected” like I did, click on Select.

Choose the certificate you want to bind to the site.

Apply the changes and retry the Exchange management shell. If it connects successfully to the server then you have most likely resolved this issue.

Exchange 2013 disable auto-mapping of mailboxes with full access

Exchange 2013 disable auto-mapping of mailboxes with full access

# Get all mailboxes in the forest
$Mailboxes = Get-Mailbox -ResultSize unlimited -IgnoreDefaultScope
$ConfirmPreference = 'None'

# Iterate over each mailbox
foreach($Mailbox in $Mailboxes)
{
    try
    {
        # Try to run the example fix against the current $Mailbox
        $FixAutoMapping = Get-MailboxPermission $Mailbox |where {$_.AccessRights -eq "FullAccess" -and $_.IsInherited -eq $false}
        $FixAutoMapping | Remove-MailboxPermission -confirm $false
        $FixAutoMapping | ForEach {Add-MailboxPermission -Identity $_.Identity -User $_.User -AccessRights:FullAccess -AutoMapping $false}
    }
    catch
    {
        # Inform about the error if unsuccessful
        Write-Host "Encountered error: $($Error[0].Exception) on mailbox $($Mailbox.DisplayName)" -ForegroundColor Red
    }
}