问题
What different ways are Machine Keys useful in asp.net? I think the following are correct but thought there may be more.
- Multiple applications can use the same cookie
- Multiple servers can work with the same viewstate
回答1:
MachineKey is used for:
- ViewState encryption and validation
- Forms Authentication (or Federated 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.
To see all details, please refer to: MSDN How To: Configure MachineKey in ASP.NET 2.0
回答2:
Machine key is also used to encrypt/decrypt the webresources.axd parameters.
Even on a single server the machine key should be configured, because any recycle of the app domain will generate a new key when it is set to auto. This causes the next postback just for pages rendered before the recycle, to cause a viewstate validation error, and also issues with the resources during that time.
回答3:
Encryption - very common.
来源：https://stackoverflow.com/questions/550210/uses-for-machinekey-in-asp-net