TokenValidationParameters no longer working after upgrade to 5.0.0

TokenValidationParameters is in assembly: Microsoft.IdentityModel.Tokens

It looks like you are using Katana (the first version of asp.net OWIN offering). Katana does not support 5.0.0. You need to stick with 4.x.

The latest version of asp.net takes a dependency on S.IM.xx and M.IM.xxx 5.0. https://github.com/aspnet

Short version: Make sure you use version 4.0 or later of the Microsoft.Owin packages, such as Microsoft.Owin.Security.Jwt.

As the other answers mentioned, there was a breaking change in System.IdentityModel.Tokens.Jwt from version 4.0 to 5.0. This caused problems because some packages like Microsoft.IdentityModel.Protocols depended on version 5.0, while older Katana/OWIN packages like Microsoft.Owin.Security.Jwt were still hardcoded to depend on version 4.0.

The good news is that this is being fixed in the new Katana 4.0 release. The 4.0 packages (such as Jwt and Cookies) have been published to NuGet as prerelease packages and will be available as stable packages soon.