To fix this, you must explicitly define the validationKey in the web.config so that it is identical across all servers in the farm.
<system.web> <machineKey validationKey="A1B2C3D4E5F67890123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" validation="SHA512" decryptionKey="FEDCBA9876543210FEDCBA9876543210" decryption="AES" /> </system.web> machinekey validationkey in web.config
By mastering the validationKey in Web.config , you ensure that your ASP.NET application remains secure, scalable, and free from the dreaded "MAC validation failed" errors. Treat this knowledge as a core part of your deployment and security toolkit. To fix this, you must explicitly define the
In ASP.NET, data is frequently sent back and forth between the server and the client. Two of the most common data payloads are and Forms Authentication Tickets . To fix this