What is and how to generate machinekey iis

What is <machinekey >  and how to generate machinekey iis

 

MachineKey is used for:

• ViewState encryption and validation
• Forms Authentication uses this key for signing the authentication ticket

Having a Web App installed on multiple servers requires same Machine Key configured on all of them in order for Load Balancing to work.
Machine key can be generated in IIS 7/ IIS 7.5 by following steps listed below
1. Open the IIS Manager.
2. Click on the Machine Key icon in the ASP.NET feature list as displayed below
 

System Will default method:

<configuration>

  <system.web>

    <machineKey decryptionKey="Decryption key goes here,IsolateApps" 

                validationKey="Validation key goes here,IsolateApps" />

  </system.web>

</configuration>

MachineKey in web.config

<?xml version="1.0"?>

<configuration>

    <appSettings/>

    <connectionStrings/>

    <system.web>

        <machineKey validationKey='5FFC6B71B2F9759DC3D84D13BC0AFC3D94131C084877C74BB75E3714E22DC4EDE4F475817B5E7036D9020218B59C81DCE466A6FD2EC814BCC522A49AE13AB849' decryptionKey='46D9D0699B89DA8087CCC6C03709BB686D53D3703D864D2E' validation='SHA1'/>

    </system.web>

</configuration>

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