When a user requests to reset his/her password an email is being sent to his/her email address containing a link. When the user navigates to that link to change the password the following message is being displayed:

There was an error setting the password. The password has not been changed.

Under Host/Membership Management we have Enable password history - disabled. 

In our web.config we have the following settings:

      <providers>

        <clear />

        <!-- Configuration for AspNetSqlMembershipProvider:

                connectionStringName="string"               Name corresponding to the entry in <connectionStrings> section where the connection string for the provider is specified

                maxInvalidPasswordAttempts="int"            The number of failed password attempts, or failed password answer attempts that are allowed before locking out a user?s account

                passwordAttemptWindow="int"                 The time window, in minutes, during which failed password attempts and failed password answer attempts are tracked

                enablePasswordRetrieval="true]"      Should the provider support password retrievals

                enablePasswordReset="[true|false]"          Should the provider support password resets

                requiresQuestionAndAnswer="[true|false]"    Should the provider require Q & A

                minRequiredPasswordLength="int"        The minimum password length

                minRequiredNonalphanumericCharacters="int"  The minimum number of non-alphanumeric characters

                applicationName="string"                    Optional string to identity the application: defaults to Application Metabase path

                requiresUniqueEmail="true"          Should the provider require a unique email to be specified

                passwordFormat="[Clear|Hashed|Encrypted]"   Storage format for the password: Hashed (SHA1), Clear or Encrypted (Triple-DES)

                description="string"                        Description of what the provider does

                -->

        <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="SiteSqlServer" enablePasswordRetrieval="true" enablePasswordReset="true" requiresQuestionAndAnswer="false" minRequiredPasswordLength="7" minRequiredNonalphanumericCharacters="0" requiresUniqueEmail="false" passwordFormat="Encrypted" applicationName="DotNetNuke" description="Stores and retrieves membership data from the local Microsoft SQL Server database" />

      </providers>

Is there anything else that needs to be changed to enable this feature? We are using DNN 734. 

Thanks

Hi Cathal, we do use a qualified password such as "abcdefg12"
From the logfile I got the following exception once I tried to reset the password:

2015-01-06 14:56:59,779 [id19903][Thread:13][FATAL] DotNetNuke.Framework.PageBase - An error has occurred while loading page.
System.FormatException: Unrecognized Guid format.
at System.Guid.GuidResult.SetFailure(ParseFailureKind failure, String failureMessageID, Object failureMessageFormatArgument, String failureArgumentName, Exception innerException)
at System.Guid.TryParseGuid(String g, GuidStyles flags, GuidResult& result)
at System.Guid..ctor(String g)
at DotNetNuke.Entities.Users.UserController.ChangePasswordByToken(Int32 portalid, String username, String newPassword, String resetToken)
at DotNetNuke.Modules.Admin.Security.PasswordReset.cmdChangePassword_Click(Object sender, EventArgs e)
at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e)
at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument)
at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
2015-01-06 14:56:59,801 [id19903][Thread:13][ERROR] DotNetNuke.Services.Exceptions.Exceptions - ~/Default.aspx?tabid=756&error=An unexpected error has occurred
System.FormatException: Unrecognized Guid format.
at System.Guid.GuidResult.SetFailure(ParseFailureKind failure, String failureMessageID, Object failureMessageFormatArgument, String failureArgumentName, Exception innerException)
at System.Guid.TryParseGuid(String g, GuidStyles flags, GuidResult& result)
at System.Guid..ctor(String g)
at DotNetNuke.Entities.Users.UserController.ChangePasswordByToken(Int32 portalid, String username, String newPassword, String resetToken)
at DotNetNuke.Modules.Admin.Security.PasswordReset.cmdChangePassword_Click(Object sender, EventArgs e)
at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e)
at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument)
at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Any ideas?

Cathal, the reset link URL is the following:
/default.aspx?ctl=PasswordReset&resetToken=bb3a160a-f639-42c7-870b-24842700032c