FIX: Active Directory Replication errors: The RPC server is unavailable. Or The target principal name is incorrect. Or The Kerberos client received a KRB_AP_ERR_MODIFIED error.

Scenario: One of your Site Domain Controller went Out-of-Sync (unable to communicate) for 10-15 days with your PDC.  When you attempt to make replication from that server to the PDC, you’ll end receiving below error messages: REPADMIN /SHOWREPS, results in error “The target principal name is incorrect.” as shown below: C:\>REPADMIN /SHOWREPSHYD-Network\INDHYD-DC02DSA Options: IS_GCSite Options: […]

FIX: DNS Manager fails with error: Access was denied.

Scenario: When you launch DNS Manager console application on your local site Domain Controller server, it will result in below error message.  You notice this behaviour when your domain controller hasn’t communicated with your PDC for a long while (say for 10-15 days), you have your server restarted during this time. During this issue its […]

Fix: The following Domain Controller could not be contacted – A local error has occurred.

Scenario: You attempt to launch the Active Directory Management Console – Active Directory Domains and Trusts, on your domain controller in a different AD site,  you’ll be notified with the below error: —————————Active Directory Domain Services————————— The following Domain Controller could not be contacted: USA-DC01.mylab.lan. A local error has occurred. —————————OK—————————   Fix: If your […]

Choosing right capacity External Memory Card for your devices and use cases

This article helps you build understanding on which memory card to choose among currently available MicroSD, MicroSDHC and MicroSDXC. Confirm Compatibility Before inserting your SD memory card, confirm the device is compatible with the SD standard by locating an SD logo on the device or referring to the device’s user manual or manufacturer information. The […]

Setup or Migrate Postfix SMTP relay server on CentOS 6.5

Scenario: You have a External SMTP relay host configured on older and physical Linux box which you would like to migrate to CentOS host in a virtualized environment. The older Linux box running on Ubuntu 6.06 + Postfix 2.2.10.  You want to migrate it to a virtual machine running CentOS 6.5 + Postfix 2.6.6. OS […]

Setup or Migrate Bind Name Server Role on CentOS 6.8

Scenario: You have a External Name Server configured on older and physical Linux box which you would like to migrate to CentOS host in a virtualized environment. The older Linux box running on Ubuntu 6.06 + BIND 9.3.2-P2.1.  You want to migrate it to a virtual machine running CentOS 6.8 + BIND 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6. OS and […]

Disabling Network Location Discovery stops Windows Systems from Pinging

Scenario: To Turn off the Network Location wizard for users, you make below changes to the Network Sharing Settings since then your Windows Systems become not responsive to the Ping command. However, RDP and C$ Drive access still works fine. Enables “Turn off file and printer sharing” for Domain (current profile)   Solution: To let […]