DotNetOpenAuth OpenID Provider "Sequence contains more than one element"

Answer 1

Same for me. I've added AXFetchAsSregTransform to provider behaviors.

Got this request from test-id.org

2010-05-04 15:18:52,353 [62] INFO  DotNetOpenAuth.Messaging.Channel [(null)] - Scanning incoming request for messages: http://vkontakteid.ru/OP
2010-05-04 15:18:52,354 [62] INFO  DotNetOpenAuth.Messaging.Channel [(null)] - Processing incoming CheckIdRequest (2.0) message:
openid.claimed_id: http://specs.openid.net/auth/2.0/identifier_select
openid.identity: http://specs.openid.net/auth/2.0/identifier_select
openid.assoc_handle: {634085684448000375}{BO+eWw==}{32}
openid.return_to: http://test-id.org/OP/AXFetch.aspx?dnoa.receiver=ctl00_ctl00_Body_TestBody_OpenIdBox&customTypeUri=&dnoa.UsePersistentCookie=Session&dnoa.userSuppliedIdentifier=vkontakteid.ru&dnoa.return_to_sig_handle=%7B634085687319675291%7D%7B%2FyFglA%3D%3D%7D&dnoa.return_to_sig=SfbNAmJRoH8xh%2BCYtYJnzlEEMhD0fv3iFM%2FVfIoMjOM257J13eHK6K%2BV2pofXJfTSS5xL5DAFDt4AXpHNJEUow%3D%3D
openid.realm: http://test-id.org/
openid.mode: checkid_setup
openid.ns: http://specs.openid.net/auth/2.0
openid.ns.alias3: http://openid.net/srv/ax/1.0
openid.alias3.if_available: alias1,alias2,alias3,alias4,alias5,alias6,alias7,alias8,alias9,alias10,alias11,alias12,alias13,alias14,alias15,alias16,alias17,alias18,alias19,alias20,alias21,alias22,alias23,alias24
openid.alias3.mode: fetch_request
openid.alias3.type.alias1: http://axschema.org/namePerson/friendly
openid.alias3.count.alias1: 1
openid.alias3.type.alias2: http://axschema.org/contact/email
openid.alias3.count.alias2: 1
openid.alias3.type.alias3: http://axschema.org/contact/country/home
openid.alias3.count.alias3: 1
openid.alias3.type.alias4: http://axschema.org/person/gender
openid.alias3.count.alias4: 1
openid.alias3.type.alias5: http://axschema.org/pref/language
openid.alias3.count.alias5: 1
openid.alias3.type.alias6: http://axschema.org/pref/timezone
openid.alias3.count.alias6: 1
openid.alias3.type.alias7: http://axschema.org/namePerson
openid.alias3.count.alias7: 1
openid.alias3.type.alias8: http://axschema.org/birthDate
openid.alias3.count.alias8: 1
openid.alias3.type.alias9: http://axschema.org/contact/postalCode/home
openid.alias3.count.alias9: 1
openid.alias3.type.alias10: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/givenname
openid.alias3.count.alias10: 1
openid.alias3.type.alias11: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/surname
openid.alias3.count.alias11: 1
openid.alias3.type.alias12: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress
openid.alias3.count.alias12: 1
openid.alias3.type.alias13: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/streetaddress
openid.alias3.count.alias13: 1
openid.alias3.type.alias14: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/locality
openid.alias3.count.alias14: 1
openid.alias3.type.alias15: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/stateorprovince
openid.alias3.count.alias15: 1
openid.alias3.type.alias16: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/postalcode
openid.alias3.count.alias16: 1
openid.alias3.type.alias17: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/country
openid.alias3.count.alias17: 1
openid.alias3.type.alias18: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/homephone
openid.alias3.count.alias18: 1
openid.alias3.type.alias19: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/otherphone
openid.alias3.count.alias19: 1
openid.alias3.type.alias20: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/mobilephone
openid.alias3.count.alias20: 1
openid.alias3.type.alias21: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/dateofbirth
openid.alias3.count.alias21: 1
openid.alias3.type.alias22: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/gender
openid.alias3.count.alias22: 1
openid.alias3.type.alias23: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/privatepersonalidentifier
openid.alias3.count.alias23: 1
openid.alias3.type.alias24: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/webpage
openid.alias3.count.alias24: 1

and got this exception

[InvalidOperationException: Sequence contains more than one element]
System.Linq.Enumerable.SingleOrDefault(IEnumerable`1 source) +6299912
DotNetOpenAuth.OpenId.Provider.Request.GetExtension() in c:\TeamCity\buildAgent\work\bf9e2ca68b75a334\src\DotNetOpenAuth\OpenId\Provider\Request.cs:176
VKontakteId.Controllers.OpenIdProviderController.SendAssertion() in D:\Projects\VKontakteId\Controllers\OpenIdProviderController.cs:83
VKontakteId.Controllers.OpenIdProviderController.Signin() in D:\Projects\VKontakteId\Controllers\OpenIdProviderController.cs:40
lambda_method(Closure , ControllerBase , Object[] ) +113
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +258
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +39
System.Web.Mvc.<>c__DisplayClassd.<InvokeActionMethodWithFilters>b__a() +125
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +640
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +312
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +709
System.Web.Mvc.Controller.ExecuteCore() +162
System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__4() +58
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +20
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +453
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +371

Answer 2

Oops. You found a bug in DotNetOpenAuth.

Fix checked into v3.2 as 7cea654 and v3.4 as bd7c148. You can get the fix in tomorrow's build.