Out look error displaying ERR_CONNECTION_RESET when I try to log into Outlook

Check Microsoft’s Service Health Status site first because the problem began today and affects only Outlook; if Outlook is degraded, wait for Microsoft to restore the service rather than changing your device settings.^1^

If service health is normal

Since restarting and fully shutting down did not help, isolate whether the connection reset is tied to the browser or network:

1. Open Outlook in another browser.
   • If it works, the original browser’s stored Outlook data or an extension is likely interfering.
   • In Microsoft Edge, select Settings and more (…) → Settings → Privacy, search, and services → Cookies → See all cookies and site data.
   • Search for and delete site data associated with Outlook and Microsoft sign-in, then retry. Deleting site cookies signs you out of that site.^2^
   • Temporarily disable ad blockers, privacy/script-blocking extensions, and confirm cookies and JavaScript are allowed. Microsoft notes that these controls can interfere with account sign-in.^3^
2. Test the same computer on a different connection.
   • Connect it temporarily to a phone’s cellular hotspot, then open Outlook.
   • If Outlook works there, the issue is with the original network path—not the Microsoft account or browser. Disconnect any VPN or proxy and retry; Microsoft identifies proxies and authenticated firewalls as possible blockers for Microsoft 365 sign-in traffic.^4^
   • On a managed work or school network, ask the administrator to verify outbound TCP/HTTPS ports 80 and 443 and access to Microsoft 365 destinations, including *.outlook.com and *.microsoftonline.com.^4^
3. If it fails in every browser and on a different network, use Microsoft’s account sign-in troubleshooter. Outlook.com’s support page recommends that route when sign-in remains unavailable.^5^

Escalation

If service health is normal but Outlook still resets across multiple browsers, devices, and networks:

• For a personal Outlook.com account, use the Still need help? option on the Outlook.com sign-in support page.^5^
• For a Microsoft 365 work or school account, ask the organization’s Microsoft 365 administrator to inspect Service health and open a Microsoft support request.

When escalating, include the exact time, browser name, whether the hotspot test worked, and a screenshot of ERR_CONNECTION_RESET.

References

1. Fixes or workarounds for recent issues on Outlook.com
2. Manage cookies in Microsoft Edge: View, allow, block, delete and use | Microsoft Support
3. How to fix 'Let's help you move forward' error | Microsoft Support
4. How to troubleshoot non-browser apps that can't sign in to Microsoft 365, Azure, or Intune | Microsoft Support
5. How to sign in to Outlook.com | Microsoft Support