The type initializer for 'System.Data.SqlClient.SqlConnection' threw an exception. InnerException: Requested registry access is not allowed.

Question

I have read some of the other posts for people that got this error, but none seem to apply to me.
My program has been working for weeks.  I made some minor changes, and started getting the error (full details below).
I did a TFS "undo pending changes" and still getting the same error, even after logging off.  The one odd thing is that I did change my Windows password this week. The connection string is using a SQL user id and password that has no issues.
I'm an Admin own my own box (running WIn XP SP3).  I even tried "Run as Admin" on Visual Studio.
I'm doing a Debug-Start, running a Console-Test-Program that calls a WCF service, which on local machine is hosted by "ASP.NET Development Server".
We have two other developers, one has the same problem, one does not.  In theory, we have all done "get latest" and are running the same code.
The SQL Connection is related to a trace database; we are using this library http://ukadcdiagnostics.codeplex.com which has worked fine for months.
When I do "Start Run" in Visual Studio, I get this error:
{"The type initializer for 'System.Data.SqlClient.SqlConnection' threw an exception. "}
with InnerException: {"The type initializer for 'System.Data.SqlClient.SqlConnectionFactory' threw an exception."}
and it has InnerException: {"Requested registry access is not allowed. "}
Outmost StackTrace:
   at System.Data.SqlClient.SqlConnection..ctor()
   at System.Data.SqlClient.SqlConnection..ctor(String connectionString)
   at FRB.Diagnostics.Listeners.SqlDataAccessCommand..ctor(String connectionString, String commandText, CommandType commandType)
   at FRB.Diagnostics.Listeners.SqlDataAccessAdapter.CreateCommand()
   at FRB.Diagnostics.Listeners.SqlTraceListener.TraceEventCore(TraceEventCache eventCache, String source, TraceEventType eventType, Int32 id, String message)
   at FRB.Diagnostics.Listeners.CustomTraceListener.FilterTraceEventCore(TraceEventCache eventCache, String source, TraceEventType eventType, Int32 id, String message)
   at FRB.Diagnostics.Listeners.CustomTraceListener.TraceEvent(TraceEventCache eventCache, String source, TraceEventType eventType, Int32 id, String format, Object[] args)
   at System.Diagnostics.TraceSource.TraceEvent(TraceEventType eventType, Int32 id, String format, Object[] args)
   at System.Diagnostics.TraceSource.TraceInformation(String message)
   at FRB.EC.AdminService.AdminService.TestHelloWorldWithTrace(String name)
   at SyncInvokeTestHelloWorldWithTrace(Object , Object[] , Object[] )
   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
Second Inner StackTrace:
   at System.Data.SqlClient.SqlConnection..cctor()
Third Inner StackTrace:
      at System.Data.SqlClient.SqlConnectionFactory..cctor()
When I do "Run as Admin", I get this error:
{"Could not load file or assembly 'FRB.EFDataAccess, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. Access is denied. "}
Server stack trace:
   at System.ServiceModel.Channels.ServiceChannel.ThrowIfFaultUnderstood(Message reply, MessageFault fault, String action, MessageVersion version, FaultConverter faultConverter)
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)
Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at FRB.EC.AdminService.ConsoleTester.svcRef.IAdminService.GetDispositionStatusTypeList()
   at FRB.EC.AdminService.ConsoleTester.svcRef.AdminServiceClient.GetDispositionStatusTypeList() in C:\SourceEagleConnect\EagleConnect\Dev\WCFServices\FRB.EC.AdminService.ConsoleTester\Service References\svcRef\Reference.cs:line 2459
   at FRB.EC.AdminService.ConsoleTester.ConsoleProgram.GetDispositionStatusTypeList() in C:\SourceEagleConnect\EagleConnect\Dev\WCFServices\FRB.EC.AdminService.ConsoleTester\ConsoleProgram.cs:line 565
   at FRB.EC.AdminService.ConsoleTester.ConsoleProgram.ExecuteNewRelease103QueryMethods() in C:\SourceEagleConnect\EagleConnect\Dev\WCFServices\FRB.EC.AdminService.ConsoleTester\ConsoleProgram.cs:line 189
   at FRB.EC.AdminService.ConsoleTester.ConsoleProgram.Main(String[] args) in C:\SourceEagleConnect\EagleConnect\Dev\WCFServices\FRB.EC.AdminService.ConsoleTester\ConsoleProgram.cs:line 76
   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()
I am also posting the web.config/app.config, but I would rather not focus on that since there were absolutely no changes to it between the time it was working and the time it began failing. 
Client app.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <connectionStrings>
  </connectionStrings>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior name="ServiceBehavior">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="false"/>
          <serviceAuthorization impersonateCallerForAllOperations="true"/>
        </behavior>
      </serviceBehaviors>
      <endpointBehaviors>
        <behavior name="FRB.AllowImpersonate">
          <clientCredentials>
            <windows allowedImpersonationLevel="Impersonation"/>
          </clientCredentials>
        </behavior>
      </endpointBehaviors>
    </behaviors>
    <bindings>
      <wsHttpBinding>
        <binding name="WSHttpBinding_IAdminService" closeTimeout="00:01:00"
          openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
          bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard"
          maxBufferPoolSize="524288" maxReceivedMessageSize="5565536"
          messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true"
          allowCookies="false">
          <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
            maxBytesPerRead="4096" maxNameTableCharCount="16384" />
          <reliableSession ordered="true" inactivityTimeout="00:10:00"
            enabled="false" />
          <security mode="Message">
            <transport clientCredentialType="Windows" proxyCredentialType="None"
              realm="" />
            <message clientCredentialType="Windows" negotiateServiceCredential="true"
              algorithmSuite="Default" />
          </security>
        </binding>
      </wsHttpBinding>
    </bindings>
        <client>
              <endpoint address="http://localhost:3588/AdminService.svc" binding="wsHttpBinding"
                    bindingConfiguration="WSHttpBinding_IAdminService" contract="svcRef.IAdminService"
                    name="WSHttpBinding_IAdminService">
                    <identity>
                          <dns value="localhost" />
                    </identity>
              </endpoint>
        </client>
    </system.serviceModel>
</configuration>
web.config of WCF service:
  <?xml version="1.0"?>
<configuration>
    <configSections>
    <section name="FRB.Diagnostics" type="FRB.Diagnostics.Configuration.UkadcDiagnosticsSection, FRB.Diagnostics"/>
  </configSections>
    <appSettings>
       <!-- whatever goes here -->
    </appSettings>
    <!-- connection string section -->
  <connectionStrings>
    <add name="log" connectionString="Data Source=myserver;Initial Catalog=ECWCFLOG_SharedDev;User ID=myuser;Password=mypass;MultipleActiveResultSets=True" providerName="System.Data.SqlClient"/>
    <add name="DBConn" connectionString="Data Source=myserver;Initial Catalog=ECData_SharedDev;User ID=myuser;Password=mypass;MultipleActiveResultSets=True" providerName="System.Data.SqlClient"/>
    <add name="EagleConnectEntities" connectionString="metadata=res://*/EagleConnect.csdl|res://*/EagleConnect.ssdl|res://*/EagleConnect.msl;provider=System.Data.SqlClient;provider connection string=&quot;Data Source=myserver;Initial
Catalog=ECData_SharedDev;User ID=myuser;Password=mypass;MultipleActiveResultSets=True&quot;" providerName="System.Data.EntityClient"/>
  </connectionStrings>
    <!-- FRB.Diagnostics logging section -->
    <FRB.Diagnostics>
        <sqlTraceListeners>
            <sqlTraceListener name="sqlTraceListenerSettings"
                        connectionStringName="log"
                        commandText="INSERT INTO LogStore VALUES(@Source, @ActivityId, @ProcessId, @ThreadId, @EventType, @Message, @Timestamp)"
                        commandType="Text">
                <parameters>
                    <parameter name="@Source" propertyToken="{Source}"/>
                    <parameter name="@ActivityId" propertyToken="{ActivityId}"/>
                    <parameter name="@ProcessId" propertyToken="{ProcessId}"/>
                    <parameter name="@ThreadId" propertyToken="{ThreadId}"/>
                    <parameter name="@EventType" propertyToken="{EventType}" callToString="true"/>
                    <parameter name="@Message" propertyToken="{Message}"/>
                    <parameter name="@Timestamp" propertyToken="{DateTime}"/>
          <!-- <parameter name="@UserId" propertyToken="{WindowsIdentity}"/> -->
        </parameters>
            </sqlTraceListener>
        </sqlTraceListeners>
        <smtpTraceListeners>
            <smtpTraceListener name="smtpTraceListenerSettings"
                         host="vssmtp"
                         port="25"
                         from="[email protected]"
                         to="[email protected]"
                         subject="AdminService Logging Event: {EventType}, {MachineName}"
                         body="{Message}&#xA;=======&#xA;Process={ProcessId},&#xA;Thread={ThreadId},&#xA;ActivityId={ActivityId}"/>
        </smtpTraceListeners>
    </FRB.Diagnostics>
    <!-- System.Diagnostics logging section -->
    <system.diagnostics>
        <sources>
            <source name="FRB.EC.AdminService" switchValue="All">
                <listeners>
                    <clear/>
                    <add name="ods"/>
                    <add name="smtp"/>
                    <add name="sql"/>
                </listeners>
            </source>
            <source name="System.ServiceModel" switchValue="Off" propagateActivity="true">
                <listeners>
                    <add name="ignored" type="System.Diagnostics.ConsoleTraceListener"/>
                </listeners>
            </source>
        </sources>
        <sharedListeners>
            <!-- OutputDebugStringTraceListener -->
            <add name="ods"
           type="FRB.Diagnostics.Listeners.OutputDebugStringTraceListener, FRB.Diagnostics"
           initializeData="{ActivityId}|{EventType}: {Message} - {DateTime}, Process={ProcessId}, Thread={ThreadId}"/>
            <!-- SqlTraceListener -->
            <add name="sql"
           type="FRB.Diagnostics.Listeners.SqlTraceListener, FRB.Diagnostics"
           initializeData="sqlTraceListenerSettings"
           traceOutputOptions="Timestamp"/>
            <!-- SmtpTraceListener -->
            <add name="smtp"
           type="FRB.Diagnostics.Listeners.SmtpTraceListener, FRB.Diagnostics"
           initializeData="smtpTraceListenerSettings">
                   <filter type="System.Diagnostics.EventTypeFilter"
                   initializeData="Error"/>
            </add>
        </sharedListeners>
        <trace autoflush="true"/>
    </system.diagnostics>
    <system.web>
    <compilation debug="true" targetFramework="4.0">
    </compilation>
        <roleManager enabled="true" defaultProvider="AspNetWindowsTokenRoleProvider"/>
    </system.web>
    <system.serviceModel>
        <services>
            <service name="FRB.EC.AdminService.AdminService"
               behaviorConfiguration="FRB.EC.AdminService.AdminServiceBehavior">
                <!-- Service Endpoints -->
                <endpoint address="" binding="wsHttpBinding"
                  bindingConfiguration="wsHttpEndpointBinding"
                  contract="FRB.EC.AdminService.IAdminService">
                    <!--
              Upon deployment, the following identity element should be removed or replaced to reflect the
              identity under which the deployed service runs. 
              If removed, WCF will infer an appropriate identity automatically.
          -->
                    <identity>
                        <dns value="localhost"/>
                    </identity>
                </endpoint>
                <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
            </service>
        </services>
        <bindings>
            <wsHttpBinding>
                <binding name="wsHttpEndpointBinding"
                 maxBufferPoolSize="2147483647"
                 maxReceivedMessageSize="500000000">
                    <readerQuotas maxDepth="2147483647"
                        maxStringContentLength="2147483647"
                        maxArrayLength="2147483647"
                        maxBytesPerRead="2147483647"
                        maxNameTableCharCount="2147483647"/>
                    <security>
                        <message clientCredentialType="Windows"/>
                    </security>
                </binding>
            </wsHttpBinding>
        </bindings>
        <behaviors>
            <serviceBehaviors>
                <behavior name="FRB.EC.AdminService.AdminServiceBehavior">
                    <!-- To avoid disclosing metadata information, set the value below to false and
               remove the metadata endpoint above before deployment -->
                    <serviceMetadata httpGetEnabled="true"/>
                    <!-- To receive exception details in faults for debugging purposes, set the value below to true. 
               Set to false before deployment to avoid disclosing exception information -->
                    <serviceDebug includeExceptionDetailInFaults="true"/>
                    <serviceCredentials>
                    </serviceCredentials>
                    <!--<serviceAuthorization principalPermissionMode="UseAspNetRoles"
                roleProviderName="AspNetWindowsTokenRoleProvider"/>-->
                    <serviceAuthorization principalPermissionMode="UseWindowsGroups"
                                impersonateCallerForAllOperations="true"/>
                </behavior>
                <behavior name="FRB.EC.AdminService.IAdminServiceTransportBehavior">
                    <!-- To avoid disclosing metadata information, set the value below to false and
               remove the metadata endpoint above before deployment -->
                    <serviceMetadata httpGetEnabled="true"/>
                    <!-- To receive exception details in faults for debugging purposes, set the value below to true. 
               Set to false before deployment to avoid disclosing exception information -->
                    <serviceDebug includeExceptionDetailInFaults="false"/>
                    <serviceCredentials>
                        <clientCertificate>
                            <authentication certificateValidationMode="PeerTrust"/>
                            <!--<authentication certificateValidationMode="Custom" customCertificateValidatorType="DataFactionServices.FRBX509CertificateValidator"/>-->
                        </clientCertificate>
                        <serviceCertificate findValue="WCfServer"
                                storeLocation="LocalMachine"
                                storeName="My" x509FindType="FindBySubjectName"/>
                    </serviceCredentials>
                </behavior>
            </serviceBehaviors>
        </behaviors>
        <serviceHostingEnvironment multipleSiteBindingsEnabled="true"/>
    </system.serviceModel>
    <system.webServer>
        <modules runAllManagedModulesForAllRequests="true"/>
    </system.webServer>
</configuration>
Thanks for any help.
Neal

Answer 1

I think I found it... this is sure a strange error for what is really happening.
Apparently it had happened to me before, and fortuantely, I actually added the following comment:
            // Above is related to the WCFLOG SQL Diagnostics Trace 
            // If you get error here an inner exception "requested registry access is not allowed"
            // inside exception "type initializer for System.Data.SqlClient.SqlConnection"
            // then make sure you have impersonation enabled in your client.
            // See AdminConsole web.config or FRB.EC.AdminService.ConsoleTester.app.config for examples
Now I think I will do a try catch and spit out the same text.
Still testing to assure that this really was the issue.
      <endpointBehaviors>
        <behavior name="FRB.AllowImpersonate ">
          <clientCredentials>
            <windows allowedImpersonationLevel="Impersonation"/>
          </clientCredentials>
        </behavior>
      </endpointBehaviors>
The line below in BOLD below is what somehow seemed to disappear from my app.config - probably due to a TFS human error - still checking that also:
        <client>
              <endpoint address="http://localhost:4998/AdminService.svc"
                              behaviorConfiguration="FRB.AllowImpersonate"
                              binding="wsHttpBinding"
                              bindingConfiguration="WSHttpBinding_IAdminService"
                             contract="svcRef.IAdminService"
                        name="WSHttpBinding_IAdminService">
                    <identity>
                          <dns value="localhost" />
                    </identity>
              </endpoint>
        </client>
Here's how I "idiot-proofed" this error for now, to give an error that actually at least points to a solution:
        public SqlDataAccessCommand(string connectionString, string commandText, CommandType commandType)
            try
                _connection = new SqlConnection(connectionString);
                // Above is related to the WCFLOG SQL Diagnostics Trace  
                // If you get error here an inner exception "requested registry access is not allowed"
                // inside exception "type initializer for System.Data.SqlClient.SqlConnection"
                // then make sure you have impersonation enabled in your client.
                // See AdminConsole web.config or FRB.EC.AdminService.ConsoleTester.app.config for examples
            catch (Exception ex)
                if (ex.ToString().Contains("The type initializer for"))
                throw new System.ApplicationException(@"
                Your client app <endpoint> must be cofigured have a
              'behaviorConfiguration' attribute like this:
                behaviorConfiguration='FRB.AllowImpersonate'
               that points back to a behavior that has this syntax:         
          <behavior name='FRB.AllowImpersonate'>
             <clientCredentials>
                 <windows allowedImpersonationLevel='Impersonation'/>
             </clientCredentials>
          </behavior>
          ", ex);
               else
                    throw ex;
            _command = _connection.CreateCommand();
            _command.CommandText = commandText;
            _command.CommandType = commandType;
            // TODO _command.CommandTimeout = ;
Neal