How to Reset CentOS or RHEL root password

In order to reset the root password for GRUB users, follow these steps:

1) Reboot Machine and when the GRUB menu appears.

2) Press letter "e'' on the keyboard to enter edit mode.

3) Use arrow keys to select the kernel line for kernel to be booted and then press "e" to edit and go to end of line and type "single" (without quotes) as a separate word,

           append "single" to ro root=LABEL=/ single

4) Press ESC key to exit the edit mode.

5) Press "b" to boot into single user mode

6) Enter passwd at cmd prompt and reset the root password a prefered password.

In order to reset the root password for LILO users, follow these steps:

1) If you are using LILO, at the LILO boot prompt press Ctrl-x to exit the graphical screen and go to the boot prompt, and then enter:

        linux single

Once you enter linux single, this will make you the "root" user without asking for a password. Once the system has booted, you can change the root password using the password command:

         passwd

Outlook 2007 using MS Exchange 2007 free busy does not show

Open the registry and explore to:

HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Options\Calendar

Click edit and create a new DWORD Value

Give the value name “UseLegacyFB” and change the value data to 1

Internet Explorer 8 and png images appears a red cross sign

It's a known issue with IE8 and in order to fix this issue, import below in registry by saving it as .reg file and double click on it.

Using Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\MIME\Database\Content Type\image/png]

"Extension"=".png"

"Image Filter CLSID"="{A3CCEDF7-2DE2-11D0-86F4-00A0C913F750}"

[HKEY_CLASSES_ROOT\MIME\Database\Content Type\image/png\Bits]

"0"=hex:08,00,00,00,ff,ff,ff,ff,ff,ff,ff,ff,89,50,4e,47,0d,0a,1a,0a

Powering off an unresponsive virtual machine on an ESX host

This article provides the correct sequence for shutting down or (when necessary) killing an unresponsive virtual machine. Answer Available Here

Memory Limits for Windows Releases

This topic describes memory limits for supported Windows releases: Click Here

For more details, refer to Microsoft Edition Comparison by Technical Specification

 

How To Troubleshoot High CPU Utilization of an MTS or COM+ Process

http://support.microsoft.com/kb/258833/

How to use the Userdump.exe tool to create a dump file

http://support.microsoft.com/kb/241215

How to create dumps of applications or the whole machine

Instruction manual on how to gather data Click Here.

How to Upload an Intermediate Certificate to a Citrix Access Gateway Appliance

Answer Available Here

Your message wasn’t delivered because of security policies in Exchange 2007

When you’re trying to send an email to a distribution group, the following error may be returned:


Delivery has failed to these recipients or distribution lists
Your message wasn’t delivered because of security policies in Exchange 2007. Microsoft Exchange will     not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.

In most cases, this error appears because you’re trying to send email from outside your organisation to an internal distribution list. By default, only authenticated users are allowed to email to a distiribution group.

Answer Available Here

Credit to Christian Gude from itexperiencenet.

Antivirus software may cause Event ID 2011

For more details refer to  MS KB

Upgrade from ESX to ESXi

We have just recently finalised the migration of our vmware infrastructure from vCneter 2 and ESX 3.5 to vSphere 4. If you reference the vmware web site, they already talking about migration path to vSphere 4.1 and more prefered path of ESXi.

So, now once again I have to plan for upgarde and complete all the business requirements and formalities to migrate to ESXi. I have started looking for information and reading on ESXi and durning this process, if I find any useful information which can assist me with graceful migration process to ESXi, I"ll add the info to my blog for my future references.

My starting point for gathering information VMware ESXi and ESX Infor Center

How to Remove old hardware after performing P2V in Windows environment

When performing P2V action on a Windows machines, the virtual machine still holds a lot of hardware components of physical machine. These components might be hidden, but still they are there and drivers are loaded for them. They might comsume resources or create issues on your virtual machine.

Which is generally not a good thing. So, how to detect those unused hardware components and drivers. All you need to do is to open the command prompt:

Enter set devmgr_show_nonpresent_devices=1

Then, open the device manager by entering the command of:

devmgmt.msc

Finally, Select View ----> Show hidden devices

You should delete all the grayed-out hardware which is not in use anymore.

vSphere Compatibility Matrixes

vSphere Compatibility Matrixes

VMware vSphere Online Library ESX 4.0 and vCenter Server 4.0

I found VMware online library very handy when you need to find out any information related to VMware, you can view VMware product documentation, search across all books in a product documentation set, and print or bookmark topics.

VMware vSphere Online Library