IIS App Pool Getting Stopped – An Investigation

One fine morning on Friday, we were reported an issue with IIS. The issue was that the application pools in IIS is getting stopped once the related website is browsed, hence resulting in HTTP Error 503 : Service Unavailable. It was also reported that the development team has not done anything specific in their code, which means issue is unexpected.

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PowerShell Cmdlets for Windows Server 2012

Check out some important powershell cmdlets that can be used to do some cool tasks in Windows Server 2012. Need to replace only those parts which are in bold and italics, as required.

Install GUI in Windows Server 2012

  • Install-WindowsFeature Server-Gui-Shell
  • Install-WindowsFeature Server-Gui-Mgmt-Infra

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MoveTree utility in AD

Move tree.exe is a command line utility that enables administrators to move AD objects such as OU’s, Users etc between domains in a single forest. This supports organizational restructuring. Moving AD objects doesn’t mean that all objects are moved. There are exceptions like computer objects or the data associated outside the AD, which are not moved during a move tree operation.

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Lost and Found in AD

It is possible to make changes to a particular object in active directory at a time by multiple administrators. In simple it is possible for two administrators to make conflicting changes to an ad at the same time. So, what if like an admin has deleted an OU from a dc and another administrator from another dc moved a user to that particular OU at the same time? What happens in this case before replication happens? There comes Lost and Found container in ad for rescue.

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Active Directory Replication – Advanced

In a complex model of several dc’s, replication would be complex since the dc’s will replicate the same data in an endless manner. Here comes UDTV for the help.
 
Up-to-dateness vector (UTD or UDTV) is a replication attribute which avoids endless replication. Each dc maintains a UDTV table for every other dc’s. This is as per the following naming context scenario:
 
                For Domain NC, each dc in a domain maintains every other dc’s UDTV values.
                For schema and Configuration NC’s, this is done for every dc in the forest.

Active Directory Replication

Active Directory Domain Services (ADDS) is a distributed directory service which stores objects, here referred to real world entities such as users, groups, computers etc. Objects in the directory are distributed among all domain controllers in a forest. ADDS replication is the process by which any changes applied to one domain controller are automatically transferred to other domain controllers and global catalogs.