After Starting the automatic Site upgrade, the following error is shown:             
               Delivery Controller address has changed...
               Re-enter the Controller address or try a new one.
               A working instance for the Configuration Logging Service could not be found.

• Checking with Get-command Get*service status and running executing all the servicestatus commands, the LogServiceStatus and MonitorServiceStatus return "DBUnconfigured".

• Checking the DataStore Connection for all the services in the registry under HKLM/SOFTWARE/Citrix/XDServices in the Controllers, the correct string is shown.

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1. Restart the Citrix services with the following PowerShell commands and then close and reopen Studio:

• Get-Service Citrix* | Stop-Service -Force
• Get-Service Citrix* | Start-Service

Note: Studio is not going to show the same error message anymore, and it should prompt for a Mandatory upgrade again. Do not proceed with the upgrade yet, and make sure you have a good backup of the database before continuing with the following steps.

2. Re-register the Log and Monitor services connection strings with the following PowerShell commands:
 

Set-MonitorDBConnection -DataStore Monitor -DBConnection $null
Set-MonitorDBConnection -DBConnection $null
Set-LogDBConnection -DataStore Logging -DBConnection $null
Set-LogDBConnection -DBConnection $null

$cs="Server=$ServerName;Initial Catalog=$SiteDBName;Integrated Security=True"
$csLogging= "Server=$ServerName;Initial Catalog=$LogDBName;Integrated Security=True"
$csMonitoring = "Server=$ServerName;Initial Catalog=$MonitorDBName;Integrated Security=True"

Set-LogDBConnection -DBConnection $cs
Set-LogDBConnection -DataStore Logging -DBConnection $csLogging
Set-MonitorDBConnection -DBConnection $cs
Set-MonitorDBConnection -DataStore Monitor -DBConnection $csMonitoring

3. Proceed with the Mandatory upgrade on Studio by clicking the "Start the automatic Site upgrade" button. If prompted, enter the credentials used by the controllers to connect to the database.

4. Wait for the upgrade to finish, and then Studio should start to work properly.
 

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Problem Cause

DBUnconfigured for the Get-LogServiceStatus and Get-MonitorServiceStatus services because the Log Service Instance and Monitor Service Instance were not registered properly .