0x80072EFD
Microsoft Teams Software
Severity: MinorWhat Does This Error Mean?
Teams error 0x80072EFD is the WinHTTP error code WININET_E_CANNOT_CONNECT — the app tried to open a connection to teams.microsoft.com or aadcdn.msftauth.net and the connection was refused or timed out.
It is the same Windows error you'd see in Edge or Office update; the fix is to find what is blocking the connection: proxy, firewall, DNS, or VPN.
Affected Models
- Microsoft Teams on Windows 10
- Microsoft Teams on Windows 11
- Teams desktop classic and new (2.0)
- Other Office apps share this error code
Common Causes
- Captive portal blocking outbound HTTPS
- Corporate proxy not configured for Microsoft 365 endpoints
- VPN routing breaking SSL connections
- DNS server unreachable or returning wrong IP
- Date and time wrong on the PC, breaking certificate validation
How to Fix It
-
Check basic internet first.
Open a web page in any browser.
If web pages don't load either, fix the network — Teams is downstream of that.
If web pages do load, the problem is specifically Teams connecting to its endpoints. -
Disable VPN temporarily.
If you are on a VPN, disconnect it and try Teams again.
VPN providers sometimes block UDP or specific TLS handshakes that Teams uses for media.
If Teams works with VPN off, ask your VPN vendor for a Microsoft 365 split-tunnel rule — Microsoft publishes the exact endpoints to allow. -
Flush DNS and reset Winsock.
Open Command Prompt as Administrator.
Run: ipconfig /flushdns
Then: netsh winsock reset
Reboot.
Resetting Winsock unblocks Teams when a third-party network filter (Cisco AnyConnect, ZScaler, AV web shield) has corrupted the network stack. -
Check date and time.
Open Settings → Time & Language → Date & time.
Make sure 'Set time automatically' is on.
An incorrect clock breaks TLS certificate validation, and 0x80072EFD is one of the symptoms.
If your clock is way off, click Sync now to force a sync. -
Reset Internet Explorer / Edge defaults.
Teams uses the WinHTTP / WinINET stack which inherits Internet Options.
Open Control Panel → Internet Options → Connections → LAN settings.
Make sure 'Use a proxy server' is unchecked unless your IT requires it.
Many work-issued PCs have a leftover proxy here from a previous network.
Frequently Asked Questions
Why does Teams show 0x80072EFD but my email still works?
Outlook talks to a different endpoint (outlook.office365.com) and uses cached credentials.
Teams needs constant real-time connections to many endpoints, including media and chat services.
A network policy that blocks one specific Microsoft hostname can leave Outlook fine while breaking Teams.