IIS (web.config) Hardening

What This Covers 
 This page explains how Steel Security applies hardening using IIS web.config configuration. 
 It provides insight into how server-level protections are implemented for Microsoft IIS environments. 
 
 What Is web.config 
 web.config is a configuration file used by Microsoft IIS servers. 
 It allows you to define rules that control: 
 
 access to files and directories 
 request handling 
 security behavior 
 
 These rules are processed by the server before requests reach WordPress. 
 
 Why Server-Level Hardening Matters 
 Server-level rules provide protection before your application is reached. 
 This helps: 
 
 block malicious requests early 
 reduce load on WordPress 
 enforce consistent security behavior 
 
 
 How Steel Security Uses web.config 
 Steel Security applies hardening by updating the web.config file. 
 These updates may include: 
 
 blocking access to sensitive files 
 restricting directory access 
 limiting execution in specific locations 
 controlling access to endpoints 
 
 Changes are applied in a controlled and reversible way. 
 
 What to Expect 
 After applying hardening via web.config : 
 
 certain requests may be blocked before reaching WordPress 
 restricted files or endpoints will return errors (e.g., 403 Forbidden) 
 security rules are enforced consistently 
 
 Most changes take effect immediately. 
 
 How to Verify 
 To verify web.config hardening: 
 
 Test access to restricted files or endpoints 
 Confirm that access is denied where expected 
 Observe server responses 
 
 You may also review IIS logs if available. 
 
 How to Revert (Rollback) 
 To revert changes: 
 
 Navigate to the hardening section in Steel Security 
 Disable the relevant control 
 Confirm the change 
 Test affected areas 
 
 Steel Security will remove or adjust the rules it applied. 
 
 Common Issues 
 Site Becomes Inaccessible 
 This may occur if: 
 
 rules are too restrictive 
 configuration conflicts exist 
 
 To resolve: 
 
 revert the most recent change 
 review applied rules 
 test incrementally 
 
 
 Changes Do Not Apply 
 
 ensure IIS is reading the updated web.config 
 check for higher-level configuration overrides 
 verify file permissions 
 
 
 Unexpected Behavior 
 
 review recent changes 
 test one rule at a time 
 check server logs for details 
 
 
 Best Practices 
 
 apply changes incrementally 
 test after each change 
 keep a backup of your web.config file 
 avoid manual edits unless necessary 
 use Steel Security controls for consistency 
 
 
 When This Applies 
 This page is relevant if your server uses Microsoft IIS. 
 If you are unsure: 
 
 check with your hosting provider 
 review your server environment 
 inspect hosting configuration tools 
 
 
 Related 
 
 Apache (.htaccess) Hardening 
 Nginx Hardening 
 Applying Hardening Safely 
 Safe Rollback Practices