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One of the sites throws this exception, when I click Login link
2015-02-23 22:15:58,189 ERROR 109.252.86.13 - es-ES - /Secure/Login.aspx?returnurl=%2f - mojoPortal.Web.Global - Referrer(http://esmexico.ru/) useragent Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.115 Safari/537.36 System.TypeInitializationException: The type initializer for 'DotNetOpenAuth.Logger' threw an exception. ---> System.IO.FileLoadException: Could not load file or assembly 'log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=1b44e1d426115821' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) at DotNetOpenAuth.Loggers.Log4NetLogger.CreateLogger(String name) at DotNetOpenAuth.Logger.CreateWithBanner(String name) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\Logger.cs:line 145 at DotNetOpenAuth.Logger..cctor() in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\Logger.cs:line 29 --- End of inner exception stack trace --- at DotNetOpenAuth.Messaging.Channel.ReadFromRequest(HttpRequestInfo httpRequest) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\Messaging\Channel.cs:line 361 at DotNetOpenAuth.OpenId.RelyingParty.OpenIdRelyingParty.GetResponse(HttpRequestInfo httpRequestInfo) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\OpenId\RelyingParty\OpenIdRelyingParty.cs:line 342 at DotNetOpenAuth.OpenId.RelyingParty.OpenIdTextBox.OnLoad(EventArgs e) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\OpenId\RelyingParty\OpenIdTextBox.cs:line 1016 at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
It seems one site has the legacy openid enabled which does not work anymore, for open id we only use janrain
To fix it
UPDATE mp_Sites SET AllowOpenIDAuth = 0
then touch web.config to clear the sitesettings cache