issued certificate not available through webservice

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C#

Visual-Studio

.NET4

webservice

, +

I have an application that is attempt to validate an LDAP SSL account. When I execute the code to authenticate the LDAP SSL connection directly through the application, it works. However, when the ValidateLDAP connection method is in the business rules and executed through the webservice - it fails.

private void cmdValidateLDAP_Click(object sender, EventArgs e)
{
  string errormsg = null;

  LDAPSettingsObject ldapSettingsObj = new LDAPSettingsObject();

  // assign values to ldap object
  ldapSettingsObj.Group_string = txtGrpString.Text;
  ldapSettingsObj.IP_Address = txtLDAPIPAddress.Text;
  ldapSettingsObj.Login_Attribute = txtLoginAttribute.Text;
  ldapSettingsObj.Password = txtLDAPPassword.Text;

  if (txtPort.Text != "" && Convert.ToInt32(txtPort.Text) > 0)
      ldapSettingsObj.Port = Convert.ToInt32(txtPort.Text);

  ldapSettingsObj.Search_base = txtSearchBase.Text;
  ldapSettingsObj.serverType =LDAPSettingsObject.LDAPServerType.ACTIVE_DIRECTORY;
  ldapSettingsObj.Username = txtLDAPUserName.Text;
  ldapSettingsObj.SSL = cbLDAPSSL.Checked;

  // testing this w/out webservice
  LdapConnection ldc = null;
  LDAPStatusCode lsc = LDAPStatusCode.OpSuccess;
  bool _bSuccess = ConnectToActiveDirectory(ldapSettingsObj,
                     ldapSettingsObj.Username, ldapSettingsObj.Password, 
                     ref ldc, ref lsc);

  // test this WITH webservice
  // bool _bSuccess = GetController.wsController.Security_ValidateLDAP(
  //                    ldapSettingsObj, ref errormsg);

  if (_bSuccess == true)
  {
    // success, display success msg
    MessageBox.Show("Connection to LDAP Server Successful",
                              MessageBoxButtons.OK);
  }
  else if (_bSuccess == false && errormsg != null)
  {
    // failure, display error message
    MessageBox.Show(errormsg.ToString(), MessageBoxButtons.OK);
  }
  else
  {
    // failure, no error, display generic message
    MessageBox.Show("Connection to LDAP Server Unsuccessful",
                              MessageBoxButtons.OK);
  }

  return;
}

The cert was installed with the administrator account. The webservice is run under the ASPNET account. I have tried to execute WinHttpCertCfg with no success.

Next I tried the FindPrivateKey which also didn't work.

Can anyone help? Thanks!