Removing Protected Server after 2012 R2 upgrade

Question

Having recently competed our upgrade to DPM 2012 R2 I now need to remove two 2003 servers from a protection group that has been decommissioned.
However whenever I use the console to modify the group and remove the servers before I can get to the update group tab the console crashes without an error! (see screenshot) It happens on the server and on my workstation using the management console but
it doesn't happen on for other protection groups so I wonder if it has something to do with the fact this is the only group with 2003 servers and non upgraded agents in. As I can't upgrade the agents I'm a little stuck.
I wondered if I could use a PowerShell command to forcibly remove the servers from the protection group then I can delete the servers entirely.
I've looks up some powershell commands but I don't appear to be getting the synx right, any help would be appreciated.
Rob

Answer 1

An unexpected error caused a failure for process 'mmc'.  Restart the DPM process 'mmc'.
Problem Details:
<FatalServiceError><__System><ID>19</ID><Seq>0</Seq><TimeCreated>02/06/2014 07:34:34</TimeCreated><Source>DpmThreadPool.cs</Source><Line>163</Line><HasError>True</HasError></__System><ExceptionType>CmdletInvocationException</ExceptionType><ExceptionMessage>Data
is Null. This method or property cannot be called on Null values.</ExceptionMessage><ExceptionDetails>System.Management.Automation.CmdletInvocationException: Data is Null. This method or property cannot be called on Null values. ---&gt; System.Data.SqlTypes.SqlNullValueException:
Data is Null. This method or property cannot be called on Null values.
   at System.Data.SqlClient.SqlBuffer.get_String()
   at Microsoft.Internal.EnterpriseStorage.Dls.UI.ObjectModel.OMCommon.ProtectionGroup.ReadBackupAndCCWindow()
   at Microsoft.Internal.EnterpriseStorage.Dls.UI.ObjectModel.OMCommon.ProtectionGroup.get_CCWindow()
   at Microsoft.Internal.EnterpriseStorage.Dls.UI.ObjectModel.OMCommon.ProtectionGroup.ScheduleVerification(DateTime startTime, Int32 maxDuration)
   at Microsoft.Internal.EnterpriseStorage.Dls.UI.Cmdlet.ProtectionCmdLets.SetProtectionJobStartTime.CallBack(Object[] paramsList)
   at Microsoft.Internal.EnterpriseStorage.Dls.UI.Cmdlet.ProtectionCmdLets.SetProtectionJobStartTime.DoProcessing()
   at Microsoft.Internal.EnterpriseStorage.Dls.UI.Cmdlet.Utils.DpmCmdletBase.ProcessRecord()
   at System.Management.Automation.CommandProcessor.ProcessRecord()
   --- End of inner exception stack trace ---
   at System.Management.Automation.Runspaces.PipelineBase.Invoke(IEnumerable input)
   at Microsoft.Internal.EnterpriseStorage.Dls.UI.UICommon.CmdLetWrapper.Invoke()
   at Microsoft.Internal.EnterpriseStorage.Dls.UI.Dpw.ConsistencyCheckOptions.OnLeavePage(LeavePageEventArgs e)
   at Microsoft.Internal.EnterpriseStorage.UI.WizardFramework.WizardPage.RaiseLeavePage(LeavePageEventArgs e)
   at Microsoft.Internal.EnterpriseStorage.UI.WizardFramework.WizardForm.ValidateAndLeavePage(WizardPage page, LeavePageEventArgs e)
   at Microsoft.Internal.EnterpriseStorage.UI.WizardFramework.WizardForm.TraversePagesToTarget(WizardPage startPage, WizardPage targetPage, NavigationDirection direction)
   at Microsoft.Internal.EnterpriseStorage.UI.WizardFramework.WizardForm.InternalNavigateToPage(WizardPage targetPage, NavigateEventArgs e)
   at System.Windows.Forms.Button.WndProc(Message&amp; m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)</ExceptionDetails></FatalServiceError>