We are trying to upgrade our IdentityServer3 instance from targeting .NET Framework 4.5 to 4.7 but stumbled on the following exception when running.
The error seems to be occurring due to the absence of a cookie that OWIN Middleware is supposed to be creating although we're not entirely sure.
System.InvalidOperationException: ID6041: The provided RSA key is invalid.
at System.IdentityModel.RsaEncryptionCookieTransform.Encode(Byte[] value)
at IdentityServer3.Core.Configuration.X509CertificateDataProtector.Protect(Byte[] data, String entropy) in c:\local\identity\server3\IdentityServer3\source\Core\Configuration\X509CertificateDataProtector.cs:line 48
at IdentityServer3.Core.Extensions.IDataProtectorExtensions.Protect(IDataProtector protector, String data, String entropy) in c:\local\identity\server3\IdentityServer3\source\Core\Extensions\IDataProtectorExtensions.cs:line 38
at IdentityServer3.Core.Configuration.Hosting.MessageCookie`1.Protect(IDataProtector protector, TMessage message) in c:\local\identity\server3\IdentityServer3\source\Core\Configuration\Hosting\MessageCookie.cs:line 73
at IdentityServer3.Core.Configuration.Hosting.MessageCookie`1.Protect(TMessage message) in c:\local\identity\server3\IdentityServer3\source\Core\Configuration\Hosting\MessageCookie.cs:line 118
at IdentityServer3.Core.Configuration.Hosting.MessageCookie`1.Write(TMessage message) in c:\local\identity\server3\IdentityServer3\source\Core\Configuration\Hosting\MessageCookie.cs:line 142
at IdentityServer3.Core.Extensions.OwinEnvironmentExtensions.CreateSignInRequest(IDictionary`2 env, SignInMessage message) in c:\local\identity\server3\IdentityServer3\source\Core\Extensions\OwinEnvironmentExtensions.cs:line 138
at IdentityServer3.Core.Results.LoginResult.Execute() in c:\local\identity\server3\IdentityServer3\source\Core\Results\LoginResult.cs:line 57
at IdentityServer3.Core.Results.LoginResult.ExecuteAsync(CancellationToken cancellationToken) in c:\local\identity\server3\IdentityServer3\source\Core\Results\LoginResult.cs:line 48
at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext() in c:\local\identity\server3\IdentityServer3\source\Core\Configuration\Hosting\ClientListCookie.cs:line
