ArticlesArticles Most Popular ArticlesMost Popular Articles
RSS Feeds
DrillDown Icon Table of Contents
DrillDown Icon 2019 Official Holidays & Support Schedule
DrillDown Icon IMPORTANT: End of Life of SHA1 on Windows Server 2003
DrillDown Icon IMPORTANT: Supported Operating Systems
DrillDown Icon PLEASE READ: Our Update Server IPs Have Changed
DrillDown Icon Support
DrillDown Icon modusGate for Microsoft Azure
DrillDown Icon modusCloud
DrillDown Icon Alleviating Spam – Best Practices
DrillDown Icon directQuarantine Technical Information
DrillDown Icon modusMail & modusGate Technical Information
DrillDown Icon Documentation & Release Information
DrillDown Icon Known Issues (non-release related)
DrillDown Icon Configuration Information
DrillDown Icon modusGate & modusMail
DrillDown Icon modusGate Only
DrillDown Icon modusMail Only
DrillDown Icon SQL Server Information
DrillDown Icon MySQL Information
DrillDown Icon Security
DrillDown Icon Sieve
DrillDown Icon Spam and False-Positives
DrillDown Icon Statistics and Monitoring Section
DrillDown Icon Web Components
DrillDown Icon How-To: Customize the Quarantine Report Template
DrillDown Icon Info: Modus v4.4.543 Message Audit Log
DrillDown Icon Info: Configuring Norton Internet Security for Webmail Access
DrillDown Icon How-To: Convert WebMail POP Servers to IMAP (v4.3+)
DrillDown Icon How-To: Customize the Date Displayed in Webmail / WebQuarantine
DrillDown Icon Info: Diagnostic Utility for WebMail / WebQuarantine
DrillDown Icon How-To: Configure the Web Components for ModusGate
DrillDown Icon How-To: Configure the Web Settings in the Modus Console
DrillDown Icon How-To: Configure Webmail for Blockade
DrillDown Icon How-To: Configure WebMail for MISP
DrillDown Icon How-To: Configure Windows 2003 for Web Components
DrillDown Icon How-To: Display the Paper Clip Icon
DrillDown Icon Problem: Invalid Class String Errors with WebAdmin or LiveMonitor
DrillDown Icon How-To: Configure and Troubleshoot Modus Web 4.x Components
DrillDown Icon Archive: Web Info - Versions 4.0 & 4.1
DrillDown Icon Safari not supported by Webmonitor
DrillDown Icon Troubleshooting
DrillDown Icon Hardware & OS System Requirements
DrillDown Icon Tools
DrillDown Icon Other Product Technical Information
DrillDown Icon Professional Services
DrillDown Icon Newsletters
  Email This ArticlePrint PreviewPrint Current Article/Category and All Sub-Articles/Categories
Problem: Invalid Class String Errors with WebAdmin or LiveMonitor


Product: All

Version & Build: All


Description of the Problem:

When attempting to log into WebAdmin and/or LiveMonitor or when trying to access the Settings options within WebMail or WebQuarantine, following error occurs:

Source : /WebAdmin/Login.aspx
Exeption Description Stack :
Invalid class string

call Stack :
   at LicObjActivatorLib.ActivatorClass.CreateLicensedInstance(String strProgID, String strKey)
   at Vircom.modusWebAdmin.VMAHelper.Server.GetServer()
   at Vircom.modusWebAdmin.UserControls.Login.CustomValidatorLogin_ServerValidate(Object source, ServerValidateEventArgs args)
   at System.Web.UI.WebControls.CustomValidator.OnServerValidate(String value)
   at System.Web.UI.WebControls.CustomValidator.EvaluateIsValid()
   at System.Web.UI.WebControls.BaseValidator.Validate()
   at Vircom.modusWebAdmin.UserControls.Login.ButtonSubmit_Click(Object sender, EventArgs e)
   at Vircom.modusWebAdmin.UserControls.Login.Page_Load(Object sender, EventArgs e)
   at System.Web.UI.Control.OnLoad(EventArgs e)
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain()



Windows 2000 Server:

This type of error, if accompanied by the lines "Server object error xxx, Server.CreateObject Failed", can occur if one of the program's components was not properly registered during the installation. There are 2 ways to fix it:

a) Manually register the specified component's dll file:

    • Make sure the dll is present on the server
    • Register at a Command Prompt:  go to the directory of the dll and use the regsvr32 command followed by the name of the dll file
      • E.g. if the "Server object error" quotes the aspupload.dll file, go to the directory containing that dll and type: regsvr32 aspupload.dll

b) Reinstall the component


Windows Server 2003:

The class string errors can point to problems with permissions settings in the registry.  To correct it, please follow the instructions outlined in this Microsoft Knowledge Base article:


Modified 1/23/2007
Keywords: invalid class string
Article ID: 1434