Setting up IIS Web Server load balancer

Ensuring that you have validationKey and decryptionKey in the web.config. This will allow all the servers in the web farm to decrypt each other's postbacks.

<system.web>

<machineKey validation="AES" validationKey="<64-byte key>" decryption="AES"

decryptionKey="<32-byte key>"/>

</system.web>

Example

<system.web>

<machineKey decryptionKey="1234567890ABCD1234567890ABCD1234567890ABCD123456" validation="AES" validationKey="1234567890ABCD1234567890ABCD1234567890ABCD1234567890ABCD1234567890ABCD1234567890ABCD1234567890ABCD1234567890ABCD1234567890ABCD12" />