update_https_bindings.ps1

Import-Module WebAdministration

# Get the latest certificate in store that applies to my site
$cert = (Get-ChildItem Cert:\LocalMachine\My |
    Where-Object {$_.Subject.Contains('*.example.com')} |
    Sort-Object -Descending {[System.DateTime]::Parse($_.GetExpirationDateString())} |
    Select-Object -First 1)

Set-Location IIS:\Sites

# Get all sites

Get-WebConfiguration -Filter "/system.applicationHost/sites/site[contains(@name, '.example.com')]/bindings/binding[@protocol='https']" | 
    Where-Object {$_.certificateHash -ne $cert.Thumbprint} | 
    % { 
        Write-Host $_
        $_.RemoveSslCertificate()
        $_.AddSslCertificate($cert.Thumbprint, 'My') 
    }

Oh my gosh!! This has saved me hours and headache. I have been searching online and using the commands from several different sites, everyone failed at some point. This one works! Thank you...Thank you!!!