Using Antiforgery in ASP.NET Core and got error - the antiforgery token could not be decrypted

Question

My ASP.Net Core MVC application have added Antiforgery middleware like below:

startup.cs

services.AddMvc();
services.Ad         


        

Answer 1

I've had this because I started using the application on a localhost port and then was trying to use it in docker with the same port. By then I had cookies that specified the key generated by my machine, so It wouldn't work on docker.

TL;DR clear your cookies if you ever used that domain/port from other machines.