IIS 7+ Kerberos authentication failure: KRB_AP_ERR_MODIFIED

KRB_AP_ERR_MODIFIED is a common Kerberos failure message. This means some encrypted Kerberos authentication data sent by the client did not decrypt properly at the server. When a Kerberos client requests a ticket for a specific service, the service is actually identified by its SPN.  The KDC grants the client a service ticket that is encrypted…

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Why we get the exception “Failed to load viewstate”

Background When we try to add controls dynamically during the post-back request for an ASPX page,   we may get below error: Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically,…

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