SharePoint Subscription Edition: Distributed Cache error after the August 2026 CU

After applying the August 2026 CU for SharePoint Subscription Edition, you may see your Distributed Cache (DC) go down.

I had the same experience and wrote this script to bring it back up:

$cacheSizeInGB = 4
$instanceName = "SPDistributedCacheService Name=SPCache"
$instance = Get-SPServiceInstance | Where-Object { "$($_.Service)" -eq $instanceName }

if( $instance ) {
    Export-SPCacheClusterConfig "temp.xml"

    $instance.Delete()

    Start-Sleep -s 10

    Import-SPCacheClusterConfig "temp.xml"

    Add-SPDistributedCacheServiceInstance -CacheSizeInMB ($cacheSizeInGB * 1024)

    $instance = Get-SPServiceInstance | Where-Object { "$($_.Service)" -eq $instanceName }
    $instance.Provision($true)

    Start-Sleep -s 10

    Get-Service "SPCache"
}

You may still see errors. I have tested this several times in my dev environment, but use it at your own risk! I have seen SharePoint farms where the Distributed Cache never came back up — until a complete rebuild of the farm plus a content database migration. Be careful!

Reference:

• August 2026 CU for SharePoint Server Subscription Edition (blog.stefan-gossner.com)