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I just added a Windows 2012 R2 server in domain and I started getting a lot of errors about Group Policy Log Name:      System Source:        Microsoft-Windows-GroupPolicy Date:          2/27/2014 5:17:13 PM Event ID:      1055 Task Category: None Level:         Error User:          SYSTEM Description: The processing of Group Policy failed. Windows could not resolve the computer name. This could be caused by one of more of the following: a) Name Resolution failure on the current domain controller. b) Active Directory Replication Latency (an account created on another domain controller has not replicated to the current domain controller). I tried many solutions i.e., DNS records verification (no duplicates), domain unjoin-rejoin, computer object permi...

In high line new features include: Improvements to vCenter Server 6.5 There are some new features that are only available on the vCenter Server Appliance. These include: Addition of a Migration Tool — The vCenter Server 6.5 Installer has a built-in Migration Tool. This tool not only makes it easier to migrate from vCenter Server 5.5 or 6.0 to 6.5, but also makes it easier to migrate to the vCenter Server Appliance 6.5 without the need to manage a separate Windows server for vSphere Update Manager. Improved Appliance Management — vCenter Server Appliance 6.5 exposes additional configuration data for CPU, memory, network, database statistics, disk space usage, and health data, reducing reliance on the command-line interface for simple monitoring and operational tasks. vCenter Native High Availability — vCenter Server Appliance 6.5 provides a built-in ability to cluster itself for high availability. Native Backup and Restore Functionality — This out-of-the-box featu...

I had a set of Windows 2008R2 servers today that were having trouble backing up the system state via Windows Server Backup – they would fail with the error “System writer is not found in the backup”. I scoured the ‘net and talked to colleagues, and all of the resolutions I could find involved re-registering components, re-securing things in the Cryptography Service (prompted by CAPI or CryptSvc errors in the event log), setting ownership on WinSXS folders, etc. I did not have any such errors in my logs to indicate a permissions issue – in fact, I saw no errors at all (usually good – not so much when something is broken!). However, every time I ran “vssadmin list writers”, indeed the system writer was missing. After taking a procmon, I noticed that the last thing that was searched were some setupapi.ev* files in \Windows\Inf: I decided, on a whim, to replace these files with files from another server I had that was working – I stopped the VSS and CryptSvc services (th...

The difference between a snapshot and a backup: A snapshot is, think about it as a Polaroid picture. You’re out, and you’re having fun with your friends, and somebody snaps a Polaroid or an Instagram or whatever the kids are using nowadays. It’s just that. It’s an instant point in time. This can be appropriate for certain types of data and it can be inappropriate for other types of data. The reason why is because the snapshot, it generally happens again at the storage level, so it doesn’t have that intelligence, maybe that a true backup software or backup product has where it lives inside the operating system. Maybe it can communicate with your database server or your exchange server. If you have something that’s very memory-intensive … Let’s take, for example, a SQL server, and it’s very transactional, you’re running a lot of database transactions very frequently, unless you get into some really, really specifics on storage array snapshots, you could end up in a state...

The AD replication PowerShell cmdlets that we’ll look at are available on Windows Server 2012, Windows Server 2012 R2, Windows 8.0 and Windows 8.1. You must install Remote Server Administration Tools (RSAT) for AD DS on non-domain controllers to use these PowerShell cmdlets. 1. Get-ADReplicationFailure The Get-ADReplicationFailure PowerShell cmdlet can be used to check AD replication status for all or specific Active Directory domain controllers. The Get-ADReplicationFailure cmdlet helps you get the information about replication failure for a specified server, site, domain, or Active Directory forest. For example, to get the replication status for a specific domain controller, failure counts, last error, and the replication partner it failed to replicate with, execute the command below: Get-ADReplicationFailure DC1.mydomain.local You can also set the scope to see the replication status for all domain controllers in a specific site. As an example, the below command r...

I was researching how to change the Subnet Mask of a DHCP scope on a Windows 2008 server. It turns out you can’t change the subnet without deleting the scope and recreating it. If there are a lot of customizations to the scope, though, like reservations and scope options, it’s no easy task to delete and recreate the scope. Luckily   I found one page   that explains how to export the scope to a text file, make changes, and then reimport it. The whole process takes only a couple of minutes, and you end up with a deleted and rebuilt scope that has all your customizations intact. Use the below command to export the scope configuration Syntax: C:\>netsh dhcp server \\”Server name” scope “scope subnet” dump>c:\dhcp.txt Example: C:\>netsh dhcp server \\Test01 scope 192.168.1.0 dump>c:\dhcp.txt That creates a text file you can edit to change the Subnet, and whatever else you want changed. Then you have to delete the s...

Promoting the first Domain Controller that runs Windows Server 2008 R2 is not a new thing. However, there are some pre-requisites that you need to look after before promoting your new Domain Controller. In this test scenario, we already have our  itserveronline.local  domain and forest which consists of only one Windows Server 2003 R2 Domain Controller with the DNS server role in a Windows 2000 Mixed domain. This article entails the different steps needed to successfully add the first and full operational Domain Controller and DNS server that runs Windows Server 2008 R2 in our forest. Prerequisites to the new server. The first step is to  prepare  the Windows Server 2008 R2 server. To start,  we need to ensure proper  Computer Name  of the new server (as per your naming convention). The next thing to check is the  IP address  of the new server. It is to be noted that the server needs to be assigned a  static  IP address. S...