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Dynamics 365 Community / Forums / Customer experience | Sales, Customer Insights,... / Repeated Login Prompts...
Customer experience | Sales, Customer Insights,...
Answered

Repeated Login Prompts in Chrome & Edge for Dynamics 365 CRM On-Premise (401 Unauthorized)

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Posted on by JG-16052054-0 4
Hello,

We're encountering persistent login prompts when accessing our Dynamics 365 CRM On-Premises environment using the latest versions of Google Chrome and Microsoft Edge. The issue does not occur in Firefox.

Environment:
  • CRM version: Dynamics 365 On-Premises
  • Authentication: Windows Authentication (no IFD/ADFS)
  • Deployment: Internal-only, for domain-joined users
  • Browsers:
    • Firefox: Works fine with SSO
    • Chrome & Edge: Repeated login prompts followed by 401 errors
What We've Checked:
  • Windows Authentication is enabled in IIS; NTLM/Negotiate order is correct
  • Anonymous Authentication is disabled
  • Site is added to Local Intranet Zone in Internet Options
  • Tried setting registry keys: AuthServerAllowlist and AuthNegotiateDelegateAllowlist for *.corp.<companyname>.com
  • Restarted browsers and verified settings via chrome://policy and edge://policy
  • Confirmed WWW-Authenticate: NTLM in DevTools
Observed Behavior:
  • Chrome and Edge attempt NTLM, receive a 401 Unauthorized, and prompt for credentials
  • This loop continues despite valid domain credentials
  • Firefox successfully authenticates using the same endpoint

We’re looking for guidance on how to get Chrome and Edge to honor Windows Authentication the same way Firefox does. Any suggestions or recommendations would be appreciated.

Thanks!
 
63f95571-46e5-4661-9a36-5071d384752d.png
Categories:
Microsoft Dynamics CRM
I have the same question (0)
  • Verified answer
    Muhammad Shahzad Shafique Profile Picture
    Muhammad Shahzad Sh... 2,375 Most Valuable Professional on at
    1. Ensure Browser Policies Are Set Correctly
    Use Group Policy or registry to define the following for all domain machines:
    Registry (HKLM or HKCU): 
    [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\AuthServerAllowlist]
Value = *.corp.<companyname>.com

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\AuthNegotiateDelegateAllowlist]
Value = *.corp.<companyname>.com
    For Edge:
    [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge\AuthServerAllowlist]
Value = *.corp.<companyname>.com

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge\AuthNegotiateDelegateAllowlist]
Value = *.corp.<companyname>.com


    2. Confirm FQDN Access Matches Allowlist
    Ensure users are accessing CRM with the fully qualified domain name (e.g., https://crm.corp.companyname.com) — not just https://crm.

    3. Set SPNs Correctly
    SPNs must be registered under the CRM App Pool Identity (domain user account): 
    setspn -S HTTP/crm.corp.companyname.com DOMAIN\crmserviceaccount
setspn -S HTTP/<serverFQDN> DOMAIN\crmserviceaccount
    4. Enable “Extended Protection” to Off (Test Case)
    In IIS → CRM Site → Authentication > Windows Authentication > Advanced Settings, try disabling Extended Protection (temporarily for testing). Some clients handle this differently.

    5. Add Site to Intranet Zone with Low Security
    • Go to Internet Options > Security > Local Intranet > Sites > Advanced
    • Add: https://crm.corp.companyname.com
    • Ensure “Automatic logon only in Intranet zone” is selected.

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