You may run into “The file has not been pre-compiled, and cannot be requested” error intermittently while accessing your ASP.NET application. The intermittent nature of the issue makes it hard to troubleshoot but there are a couple of common causes of this issue. Let’s have a look a them and the possible solutions.
Read MoreCategory: Development
Invalid URI: The format of the URI could not be determined (System.UriFormatException)
I have recently seen a web application throwing System.UriFormatException error with this message: Invalid URI: The format of the URI could not be determined. It is one of the errors that is almost always related to code, not IIS or other components.
Anti-forgery token and anti-forgery cookie related issues
Anti-forgery token prevents CSRF (Cross-Site Request Forgery) attacks. The server associates this token with current user’s identity and sends it to the client. In the next request from client, the server expects to see this token. If the token is missing or it is different, then the server rejects the request (Reference).
I have recently worked on some anti-forgery related errors. These are the error messages I saw in Event Viewer:
Read MoreThe provided anti-forgery token was meant for a different claims-based user than the current user.
The provided anti-forgery token was meant for user “”, but the current user is “andre.boucher”.
The anti-forgery cookie token and form field token do not match.
The required anti-forgery cookie “__RequestVerificationToken” is not present.