Upgrading Windows Server 2012 to 2012 R2: Things to be mindful of

System Requirements:

  • Windows Server 2012
  • Windows Server 2012 R2

The Problem:

This article outlines a few tips to be mindful of when performing an in-place upgrade from Windows Server 2012 to Windows Server 2012 R2.

More Info

Without wishing to be verbose on this one, the simple answer is that there appears to be a bug / limitation / “feature” of the iSCSI Target component of Server 2012 during upgrade that will cause you some issues. It isn’t a client issue that you will encounter.

Operating System Features

The following core features will not be available after upgrading from 2012 to 2012 R2

  • Servermanagercmd.exe
  • Slmgr.vbs
  • System Image Backup
  • Windows Server Resource Manager


The network profiles for non-domain adapters will drop back to Public after the upgrade, altering the active firewall configuration.


After the upgrade install, the Windows Firewall will inherit most firewall configuration settings from the previous configuration, however the port configurations for the iSCSI Target services will be in a disabled state, preventing your iSCSI Initiators from connecting to the service.

The upgrade process will fully de-install your NIC’s, although in general most of the main configuration settings are retained and re-applied after the upgrade (IP, Net mask etc), the advanced adapter settings are not applied. In particular, and Jumbo Frame settings designed to support extended MTU’s on your SAN NIC’s will have been reset to the standard 1500 bytes. This will have a performance hit on SAN access and Hyper-V live migration performance. You should manually re-enable the Jumbo frame settings (9014 or 9000 bytes) but be aware that it will cause the NIC to drop and re-initialise when you hit apply.

Update 24/02/2015: It is worth noting that the 2012 (R1) iSCSI target file format uses the legacy VHD format while new iSCSI targets created under 2012 R2 defaults to VHDX which supports larger volumes and better error protection technologies. Perhaps most important is the fact that VHDX is required to support the use of 512e/4K hard drives i.e. non ‘legacy’ 512n hard drives. Here in 2015, if you buy a drive larger than 1TB, it will most likely be a 512e/4K drive. If you migrate from 2012 R1 to 2012 R2 or to a future Windows version onto 4K disks, you will likely see a slump in performance unless you take remedial action to deal with it during the migration. My recommendation is that while you are taking down your iSCSI services to perform the upgrade, perform a VHDX migration of the iSCSI Target LUN using an offline server and swap the VHD for the VHDX before you go back into production. If you don’t do it now, you will either have to do it sooner or later or forget completely and suffer data integrity and system performance issues at a later point in time.


A number of the SysInternals apps, for example BGInfo, that work fine under 2012 have small issues under 2012 R2. BGInfo has a recent update that makes it aware of 2012 R2 and IE 11 rather than reporting that the OS is Windows 6.2 running MSIE 9.0.11.

WSUS 3.0 SP3

Ensure that any legacy WSUS 3.0 servers are patched to SP2 with KB2828185 installed. After re-synchronising, changing the product configuration and synchronising a second time that you server can update from your existing WSUS infrastructure. Be prepared for any 2012 R2 Data Center servers to report in WSUS as Windows 2000 Data Centre however!

Removing the Windows.old uninstall cache without installing Desktop Experience

Unfortunately you can no longer copy/paste the two cleanmgr.exe files out of WinSxS like you used to be able to do with 2008 (the store is compressed). I found that a few loops of the following will eventually remove the Windows.old upgrade cache from the root of the OS drive.

:: This is very slow as it is disk intensive: run out of hours!!
takeown /F C:\windows.old /R /D Y
takeown /F c:\Windows.old\* /R /A /D Y
takeown /F C:\windows.old /R /D Y
takeown /F c:\Windows.old\* /R /A /D Y
cacls C:\windows.old /T /G Administrators:F
rd /s /q C:\windows.old

p.s. run each line manually, the above is not setup as a batch script and will ask for yes / no input. Several runs may be required.


Your desktop wallpaper will be reset to the default grey Windows Server logo, re-create as necessary

Don’t forget to activate against your KMS or enter your key.

Dell iDRAC 7 is now completely inaccessible to any of the 2012 R2 servers because IE11 is not yet supported. To run it, disable Protected mode and add the IP address of the DRAC server to the Compatibility Mode view

0xefff0003 New-IscsiTargetPortal : Connection Failed on iSCSI Initiator client when conecting to a newly created iSCSI Target hosted on a Windows Server 2012 file server after changing server NIC configuration

System Requirements:

  • Windows Hyper-V Server 2012
  • Windows Hyper-V Server 2012 R2
  • Windows Server 2012

The Problem:

About 3 weeks ago, I completed the physical hardware installation of redundant NIC’s in a Hyper-V cluster that was backed onto a Windows Server 2012 server iSCSI SAN. The additional physical NIC’s were installed on the clients and communication between nodes worked as expected. The ports on the new NIC were placed into a new private address range of 192.168.100. Some were also removed from an existing multi-port NIC in the 192.168.254/24 range.

A couple of weeks later it came time to change the iSCSI SAN targets on the clients to use a the new adapters to move from 254/24 to 100/24.

New-IscsiTargetPortal -TargetPortalAddress

With the correct firewall and chap settings, it should have connected. Instead it returned

New-IscsiTargetPortal : Connection Failed.
At line:1 char:1
+ New-IscsiTargetPortal -TargetPortalAddress
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (MSFT_iSCSITargetPortal:ROOT/Micro
soft/...CSITargetPortal) [New-IscsiTargetPortal], CimException
+ FullyQualifiedErrorId : HRESULT 0xefff0003,New-IscsiTargetPortal

The firewall’s were OK, ping was OK. The DNS Connection Suffix, DNS Server (or lack of) were OK and NetBIOS over TCP/IP was disabled.

I could remove and reconnect the server using the original address without any problems.

More Info

Without wishing to be verbose on this one, the simple answer is that it appears to be a bug / limitation / “feature” of the iSCSI Target component of Server 2012. It was not a client issue.

The problem was that Windows had not been rebooted since standing up the new multi-port NIC (some 3 weeks prior). Yes, it was rebooted to put the hardware in, but once the NIC heads on the adapter had been configured it had not been rebooted subsequently.

It would appear that Storage Manager in Server 2012 does not force the iSCSI Target driver subsystem to re-parse the available adapter list.

In going into Server Manager > File and Storage Services > (right click the Storage server offering the iSCSI LUN) > iSCSI Target Settings

The list contained a number of network addresses that were REMOVED 3 weeks ago, but none of the NEW IPv4 or IPv6 addresses assigned to the new NIC were available.

Closing and re-opening Storage Manager made no difference.

The Fix

I sighed and being forced into unexpected maintenance on the cluster storage back end shutdown the cluster, updated drivers and firmware, cleared out Windows Update and rebooted.

After the reboot, all of the new addresses were available in Storage Manager and the redundant ones had disappeared.

So quite simply, reboot (or fully restart all iSCSI services).

ADODB.Connection error ‘800a0e7a’ – Provider cannot be found. It may not be properly installed

System Requirements:

  • Windows NT 4.0
  • Windows 2000
  • Windows XP (x86)
  • Windows Server 2003 (x86)
  • Windows Server 2008 (x86)
  • Windows 7 (x86)
  • Windows Server 2003 (x64)
  • Windows Vista (x64)
  • Windows 7 (x64)
  • Windows Server 2008 (x64)
  • Windows Server 2008 R2 (x64)
  • Windows Server 2012 (x64)

The Problem:

When you attempt to connect to a Microsoft Access database using the ODBC provider Microsoft.Jet.OLEDB.4.0 you receive the error message:

ADODB.Connection error ‘800a0e7a’
Provider cannot be found. It may not be properly installed./path/file.asp, line ##


More Information:

For x64 Systems:

The Microsoft.Jet.OLEDB.4.0 is only available as a 32-bit (x86) module. In order to use it via IIS you must change the web site to run in a 32-bit application pool.

Under IIS 7.0, 7.5 or 8.0:

  • Assuming that you will not want to use ASP .net, in the IIS console in the Application Pools section, create a no managed code, integrated application pool. If you do want to maintain access to ASP .net, select the framework version you require.
  • Once created, in its advanced settings set “Enable 32-bit Applications” to true
  • In the Basic Settings… for the web site entry you are experiencing the error on, change the Application Pool to the newly created 32-bit pool.
  • Restart the web site

In most cases where the system is running under an x64 architecture, this should fix the problem.

For x86 and x64 Systems:

We had a server down for an entire day because of this one. It was either an attempt to fix a security database fault, or an update from Microsoft Update delivered in the April 2008 patch cycle, but after the reboot for the patches, none of the JET (Access) databases on the particular server, in any IIS web would operate.

I will simply cut to the fix for you in the beginning, to expedite your likely finding of a resolution to this problem. Something had caused the service provider for the Microsoft.Jet.OLEDB.4.0 provider to become unregistered. To fix the problem issue the following command from a Command Prompt or Run:

regsvr32.exe msjetoledb40.dll

You shouldn’t need to reboot to solve the problem, it didn’t in my case. However, if nothing happens do restart before progressing to the next step.


Additional Steps: Step 1

Reregister the components from MDAC, JET and ADO in their entirety. Simply copy the below into a BAT file and run it.

:: ADODB.Connection error '800a0e7a'

:: Provider cannot be found. It may not be properly installed.regsvr32.exe cfgmgr32.dll -s

regsvr32.exe cliconfg.dll -s

regsvr32.exe dasetupr.dll -s

regsvr32.exe dbmsgnet.dll -s

regsvr32.exe dbmsrpcn.dll -s

regsvr32.exe dbnetlib.dll -s

regsvr32.exe dbnmpntw.dll -s

regsvr32.exe expsrv.dll -s

regsvr32.exe msadce.dll -s

regsvr32.exe msadcer.dll -s

regsvr32.exe msadcf.dll -s

regsvr32.exe msadcfr.dll -s

regsvr32.exe msadco.dll -s

regsvr32.exe msadcor.dll -s

regsvr32.exe msadcs.dll -s

regsvr32.exe msadds.dll -s

regsvr32.exe msaddsr.dll -s

regsvr32.exe msader15.dll -s

regsvr32.exe msado15.dll -s

regsvr32.exe msadomd.dll -s

regsvr32.exe msador15.dll -s

regsvr32.exe msADOX.dll -s

regsvr32.exe msadrh15.dll -s

regsvr32.exe mscpxl32.dll -s

regsvr32.exe msdadc.dll -s

regsvr32.exe msdadiag.dll -s

regsvr32.exe msdaenum.dll -s

regsvr32.exe msdaer.dll -s

regsvr32.exe msdaora.dll -s

regsvr32.exe msdaorar.dll -s

regsvr32.exe MSDAOSP.dll -s

regsvr32.exe msdaprsr.dll -s

regsvr32.exe msdaprst.dll -s

regsvr32.exe msdaps.dll -s

regsvr32.exe msdarem.dll -s

regsvr32.exe msdaremr.dll -s

regsvr32.exe msdart.dll -s

regsvr32.exe msdasc.dll -s

regsvr32.exe msdasql.dll -s

regsvr32.exe msdasqlr.dll -s

regsvr32.exe msdatl3.dll -s

regsvr32.exe msdatt.dll -s

regsvr32.exe msdaurl.dll -s

regsvr32.exe msdfmap.dll -s

regsvr32.exe msjro.dll -s

regsvr32.exe msjtes40.dll -s

regsvr32.exe msorc32r.dll -s

regsvr32.exe msorcl32.dll -s

regsvr32.exe msvcirt.dll -s

regsvr32.exe msvcrt.dll -s

regsvr32.exe mswdat10.dll -s

regsvr32.exe mswstr10.dll -s

regsvr32.exe msxactps.dll -s

regsvr32.exe msxml3.dll -s

regsvr32.exe msxml3a.dll -s

regsvr32.exe msxml3r.dll -s

regsvr32.exe mtxdm.dll -s

regsvr32.exe mtxoci.dll -s

regsvr32.exe odbc16gt.dll -s

regsvr32.exe ODBC32.dll -s

regsvr32.exe ODBC32GT.dll -s

regsvr32.exe odbcbcp.dll -s

regsvr32.exe odbcconf.dll -s

regsvr32.exe ODBCCP32.dll -s

regsvr32.exe ODBCCR32.dll -s

regsvr32.exe ODBCCU32.dll -s

regsvr32.exe ODBCINT.dll -s

regsvr32.exe ODBCTRAC.dll -s

regsvr32.exe oledb32.dll -s

regsvr32.exe oledb32a.dll -s

regsvr32.exe oledb32r.dll -s

regsvr32.exe setupapi.dll -s

regsvr32.exe sqloledb.dll -s

regsvr32.exe sqlsrv32.dll -s

regsvr32.exe sqlunirl.dll -s

regsvr32.exe sqlxmlx.dll -s

regsvr32.exe vbajet32.dll -s:: OLEdB

regsvr32.exe %SystemRoot%\System32\msjetoledb40.dll:: Jet

regsvr32.exe %SystemDrive%\Program Files\Common Files\Microsoft Shared\DAOdao360.dll -s

regsvr32.exe %SystemRoot%\System32\expsrv.dll -s

regsvr32.exe %SystemRoot%\System32\msexch40.dll -s

regsvr32.exe %SystemRoot%\System32\msexcl40.dll -s

regsvr32.exe %SystemRoot%\System32\jet500.dll -s

regsvr32.exe %SystemRoot%\System32\msjet35.dll -s

regsvr32.exe %SystemRoot%\System32\msjet40.dll -s

regsvr32.exe %SystemRoot%\System32\msjetol1.dll -s

regsvr32.exe %SystemRoot%\System32\msjint40.dll -s

regsvr32.exe %SystemRoot%\System32\msjter40.dll -s

regsvr32.exe %SystemRoot%\System32\msjtes40.dll -s

regsvr32.exe %SystemRoot%\System32\msltus40.dll -s

regsvr32.exe %SystemRoot%\System32\mspbde40.dll -s

regsvr32.exe %SystemRoot%\System32\msrd2x40.dll -s

regsvr32.exe %SystemRoot%\System32\msrd3x40.dll -s

regsvr32.exe %SystemRoot%\System32\msrepl40.dll -s

regsvr32.exe %SystemRoot%\System32\mstext40.dll -s

regsvr32.exe %SystemRoot%\System32\mswdat10.dll -s

regsvr32.exe %SystemRoot%\System32\mswstr10.dll -s

regsvr32.exe %SystemRoot%\System32\msxbde40.dll -s

regsvr32.exe %SystemRoot%\System32\spmsg.dll -s

regsvr32.exe %SystemRoot%\System32\vbajet32.dll -s

:: ADO
regsvr32.exe %SystemDrive%\Program Files\Common Files\System\ado\msader15.dll -s
regsvr32.exe %SystemDrive%\Program Files\Common Files\System\ado\msado15.dll -s
regsvr32.exe %SystemDrive%\Program Files\Common Files\System\ado\msadomd.dll -s
regsvr32.exe %SystemDrive%\Program Files\Common Files\System\ado\msador15.dll -s
regsvr32.exe %SystemDrive%\Program Files\Common Files\System\ado\msadox.dll -s
regsvr32.exe %SystemDrive%\Program Files\Common Files\System\ado\msadrh15.dll -s
regsvr32.exe %SystemDrive%\Program Files\Common Files\System\ado\msjro.dll -s

Additional Steps: Step 2

Reinstall MDAC 2.8 SP1 (Windows XP SP1 or below only). You will need to perform some registry modifications before you can reinstall MDAC as it is a protected system module.

  1. Open Regedit
  2. Navigate to:
  3. Look through each class ID for the following friendly name values. Delete the Class ID containing the matching friendly names:
    Microsoft MDAC Response Files
    Microsoft MDAC Setup Files
    Microsoft SQL Server ODBC Drivers
    Microsoft SQL Server Net Libs
    Microsoft SQL Server OLEDB Provider
    WebData Setup Exception Package
    Mdac 2.8 Exception Package
  4. Download and reinstall MDAC 2.8 SP1 from Microsoft which should reinstall in full.