Many .NET applications deployed in Windows-centric environments face authentication friction: users are repeatedly prompted for credentials, services fail to negotiate properly across proxies, and security teams struggle to enforce consistent Windows identity handling. When Kerberos and NTLM aren’t integrated correctly, you get unreliable sign-in behavior, higher helpdesk volume, and increased risk from fallback mechanisms.
DevionixLabs integrates Kerberos and NTLM authentication into your .NET applications so users get seamless Windows authentication while your security posture remains controlled. We implement the correct negotiation behavior for your environment—configuring SPNs, validating ticket flows, and ensuring your application correctly interprets Windows identities for authorization. For NTLM, we provide safe fallback behavior where required, with logging and configuration that helps you understand when and why negotiation falls back.
What we deliver:
• Kerberos integration with SPN and ticket negotiation guidance for your .NET app
• NTLM configuration for controlled fallback in environments where Kerberos isn’t available
• Windows identity extraction and mapping to your application authorization model
• Reverse proxy and load balancer compatibility checks for authentication headers and negotiation
• Diagnostic logging and troubleshooting playbooks for common domain and DNS issues
We start by assessing your deployment topology: domain setup, DNS, load balancers, reverse proxies, and whether your app is hosted on IIS or another .NET hosting model. Then we implement authentication configuration that matches your infrastructure constraints. Instead of treating Kerberos/NTLM as a checkbox, DevionixLabs ensures the integration is resilient—handling edge cases like multi-domain scenarios, service account permissions, and environment-specific SPN registration.
BEFORE vs AFTER, your users move from credential prompts and inconsistent sign-in to a stable Windows-auth experience that reduces support tickets and improves auditability of identity-based access.
BEFORE DEVIONIXLABS:
✗ users see repeated credential prompts
✗ authentication fails behind proxies or load balancers
✗ authorization logic can’t reliably map Windows identity
✗ helpdesk tickets rise due to negotiation failures
✗ security teams lack visibility into fallback behavior
AFTER DEVIONIXLABS:
✓ seamless Windows authentication with fewer login prompts
✓ reliable negotiation across your hosting and proxy setup
✓ consistent identity-to-authorization mapping
✓ reduced helpdesk volume through better diagnostics
✓ improved security visibility and controlled fallback behavior
The outcome is a production-ready Kerberos/NTLM integration that delivers a smooth user experience while keeping identity handling transparent and secure.
Free 30-minute consultation for your Internal enterprise web apps, intranet portals, and Windows-authenticated .NET services in regulated IT environments infrastructure. No credit card, no commitment.