Outlook Error Codes

How to Fix Outlook Error 0x80040115 When Sending or Receiving Email

John Wilson Oct 22, 2026 869 views

Question details

The user is experiencing error code 0x80040115 in Microsoft Outlook while trying to send or receive emails and needs a reliable way to restore email connectivity.

How to Fix Outlook Error 0x80040115 When Sending or Receiving Email

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Sending or receiving emails through an Exchange server using Microsoft Outlook.
Observed behavior: Outlook fails to sync, send, or receive emails and displays error code 0x80040115, remaining disconnected from the email server.

Before you start

Before proceeding with these fixes, ensure your device has an active internet connection and try restarting your router to rule out basic connectivity issues.

Solution 1Recommended

Flush DNS Cache and Verify Network Connection

Clearing the DNS resolver cache can fix temporary network glitches that prevent Outlook from finding the correct Exchange server IP address.

A corrupted DNS cache is one of the most common causes of Outlook error 0x80040115. Flushing the DNS forces your computer to request fresh IP addresses for the servers it connects to.

Open Command Prompt as Administrator

Click the Windows Start menu, type 'cmd' in the search bar, right-click on 'Command Prompt', and select 'Run as administrator'.

Execute the Flush DNS Command

In the Command Prompt window, type 'ipconfig /flushdns' and press Enter.

Verify Successful Flush

Wait for the message stating 'Successfully flushed the DNS Resolver Cache'.

Restart Outlook

Close the Command Prompt, restart your computer, and open Microsoft Outlook to check if the connection is restored.

Flush DNS Cache and Verify Network Connection

Network Refresh: Flushing your DNS will safely clear out old network records without deleting any personal files or emails.

Solution 2

Run Outlook in Safe Mode to Disable Add-ins

Third-party add-ins can conflict with Outlook's send/receive processes. Running in Safe Mode helps identify if an add-in is the root cause.

Solution 3

Repair Your Outlook Data File using ScanPST

A corrupted Outlook profile or data file (PST/OST) can trigger error 0x80040115. Microsoft's built-in Inbox Repair Tool can fix these data corruptions.

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Frequently Asked Questions

What exactly does Outlook error 0x80040115 mean?

This error code usually indicates that Microsoft Outlook is unable to connect to the Exchange server. It is commonly caused by network connectivity issues, corrupted DNS caches, or conflicts with third-party add-ins blocking the communication.

Can third-party antivirus software cause Outlook error 0x80040115?

Yes, overly strict third-party antivirus or firewall settings can mistakenly block Outlook from communicating with the email server. Temporarily disabling your security software can help determine if it is the root cause of the error.

Will repairing my Outlook data file delete my emails?

No, using the built-in SCANPST tool to repair your PST or OST file is designed to fix structural corruption without deleting your emails. However, it is always recommended to create a backup copy of your data file before running any repair tools.

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