ASP.Net Identity GenerateEmailConfirmationTokenAsync fails

Question

I am working on a MVC project to separate identity stuff from the startup MVC project. On user registration when executes the line

UserManager.GenerateEmailConfirmationTokenAsync(userId)

it will throw System.ArgumentException with message

If a list of purposes is specified, the list cannot contain null entries or entries that are comprised solely of whitespace characters. Parameter name: purposes

Stack trace

at System.Web.Security.MachineKey.Protect(Byte[] userData, String[] purposes)
   at Microsoft.Owin.Host.SystemWeb.DataProtection.MachineKeyDataProtector.Protect(Byte[] userData)
   at Microsoft.Owin.Security.DataProtection.AppBuilderExtensions.CallDataProtectionProvider.CallDataProtection.Protect(Byte[] userData)
   at Microsoft.AspNet.Identity.Owin.DataProtectorTokenProvider`2.<GenerateAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNet.Identity.UserManager`2.<GenerateUserTokenAsync>d__fe.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Robot.ACG.Web.Controllers.AccountController.<Register>d__15.MoveNext() in...

Any Ideas?

I create the user above this line and gets the created users id in to this. in my case this is an int. — Asiri Dissanayaka
– Asiri Dissanayaka, Commented Mar 7, 2017 at 11:23
According to Microsoft, this method expects a TKey argument. Check out this thread, get a proper user object and pass its `id´ property instead: stackoverflow.com/questions/22755700/… — LocEngineer
– LocEngineer, Commented Mar 7, 2017 at 11:32

Martijn Pieters · Accepted Answer · 2019-02-22 12:47:45Z

1

GenerateEmailConfirmationTokenAsync generates a token. Problem might come from your different servers:

If your token was generated on one server, and then attempting to validate it on another. Reason for that is that the token is protected via MachineKey.Protect. That is configured on OWIN initialisation.

From Max Vasilyev, Trailmax Tech.

edited Feb 22, 2019 at 12:47

Martijn Pieters

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answered Mar 7, 2017 at 11:03

Muhammad Saqlain

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3 Comments

Asiri Dissanayaka Over a year ago

In my case I have both projects in same solution. So I hope the machine key will be the same. I tried with machinekey in web.config also. Still the same.

Muhammad Saqlain Over a year ago

Its all about token. If you call ConfirmEmailAsync then the token is passed to VerifyUserTokenAsync(userId, "Confirmation", token) where “Confirmation” is a purpose.

Chris Pratt Over a year ago

@AsiriDissa: Machine key has nothing to do with the solution. Machine keys, by default, are generated per site in IIS. If you need to share the machine key between sites, you need to generate one in IIS and then apply it in the Web.config of each site manually.

Pieter van Kampen · Accepted Answer · 2017-04-08 18:39:18Z

0

I think your problem is that you should not pass an Id, but a user, at least when you are using asp.net Core:

UserManager.GenerateEmailConfirmationTokenAsync(user)

answered Apr 8, 2017 at 18:39

Pieter van Kampen

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