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Outlook error fix · Classic Outlook (Windows)

Fix Outlook Error 0x800ccc0e / 0x800ccc0f

Both Outlook errors 0x800ccc0e and 0x800ccc0f mean the same thing: classic Outlook couldn't connect to your mail server, or the connection dropped mid-send. Common causes are a wrong server port, a missing outgoing-authentication tick, or a password that changed. Here's the exact fix, step by step.

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By the 365 Techies team · Reviewed 6 October 2026

What it means

What errors 0x800ccc0e and 0x800ccc0f actually mean

These two codes are twins. 0x800ccc0e means Outlook cannot connect to the server at all; 0x800ccc0f means the connection was interrupted partway through. The usual accompanying message is "Task '...' reported error (0x800ccc0e): The connection to the server was interrupted."

The good news: this is almost never a broken mailbox. It's Outlook and your mail server not agreeing on how to talk to each other. The four common culprits are:

  • A wrong incoming or outgoing server name or port.
  • The "My outgoing server (SMTP) requires authentication" box left unticked.
  • A password that was recently changed and never updated in Outlook — or a provider (such as Gmail or Yahoo with two-step verification) that now needs an app password.
  • A firewall, VPN or antivirus email-scanner sitting between Outlook and the server.

// WINDOWS PCS ONLY

We do not support Outlook on Apple Macs, iPads or iPhones. Apple does not allow our remote-support tool to take control of an iPad or iPhone (an Apple restriction), and our remote support covers Windows PCs only. On an Apple device, Microsoft’s own Outlook help is the place to start.

// FIX IT WITH ME · STEP BY STEP

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The steps from this guide, one at a time, in the order that fixes the most cases fastest. Tell it what happened and it shows the next step. Nothing here leaves your device.Last reviewed 6 October 2026

Checking which Windows you have…STEP 1 OF 7
  1. 01Open Account Settings

    In classic Outlook go to File > Account Settings > Account Settings, select your account on the Email tab and click Change.

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Step by step

How to fix it in classic Outlook (Windows)

Work through these in order. Before you start, if you know your mail provider switched on two-step verification recently, generate an app password from your provider's security page first — you'll need it at step 4.

  1. Open your account settings. In classic Outlook go to File > Account Settings > Account Settings. On the Email tab, click your account, then Change.
  2. Check the incoming server and port. Click More Settings > Advanced. For IMAP the incoming port should be 993 with SSL/TLS; for POP it should be 995 with SSL/TLS. Confirm the server name matches your provider's (for example imap or pop dot your-provider dot com).
  3. Check the outgoing (SMTP) server and port. On the same Advanced tab, set the outgoing port to 587 with STARTTLS (some providers use 465 with SSL). Then open the Outgoing Server tab and tick "My outgoing server (SMTP) requires authentication" and "Use same settings as my incoming mail server".
  4. Re-enter your password. If your password changed, click Change on the main screen and retype it. Where your provider (such as Gmail or Yahoo) uses two-step verification, paste the app password here instead of your normal one. Microsoft accounts (Outlook.com, Hotmail, Live) sign in with a browser pop-up instead — you don't type an app password for those.
  5. Test the settings. Back on the change screen, click Test Account Settings. Both the incoming and outgoing tests should show a green tick. If one fails, the tab it points to is where the wrong setting is.
  6. Repair the account if it still fails. Close back to File > Account Settings > Account Settings, select the account on the Email tab and click Repair, then follow the wizard and restart Outlook.
  7. Rule out your security software. If it only fails intermittently, briefly turn off any antivirus "email scanning" or "mail shield" feature (and disconnect any VPN) and test again. If that fixes it, add Outlook as an exception and switch protection back on.

No step here deletes any mail — you're only correcting connection settings, so your messages stay exactly where they are.

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// GOOD QUESTIONS

Frequently asked

Is error 0x800ccc0f different from 0x800ccc0e?

They're essentially the same problem. 0x800ccc0e means Outlook couldn't connect to the server; 0x800ccc0f means the connection was interrupted after it started. Both are fixed the same way: correct the server names and ports, tick outgoing-server authentication, re-enter the password, and rule out a firewall, VPN or antivirus email scanner.

Which ports should I use for IMAP, POP and SMTP?

For a secure connection in classic Outlook use IMAP incoming port 993 with SSL/TLS, or POP incoming port 995 with SSL/TLS. For sending, use SMTP outgoing port 587 with STARTTLS (some providers use 465 with SSL). Always tick "My outgoing server (SMTP) requires authentication" as well.

Why did this start right after I changed my email password?

Outlook is still trying the old password, so the server refuses the connection. Go to File > Account Settings > Account Settings, select the account, click Change, and retype the new password. If your provider (such as Gmail or Yahoo) uses two-step verification, you'll need an app password from their security page rather than your normal login.

What is an app password and do I need one?

If your provider (such as Gmail or Yahoo) has two-step verification switched on, your normal password won't work in classic Outlook when the account is set up manually. You generate a one-off "app password" on the provider's security settings page and paste that into Outlook instead. It only works for that one app and can be revoked any time. Microsoft accounts (Outlook.com, Hotmail, Live) don't use app passwords — they sign in with a secure browser pop-up.

Could my antivirus or VPN be causing 0x800ccc0e?

Yes. Antivirus "email scanning" features and some VPNs sit between Outlook and the mail server and can break the connection. Temporarily disable email scanning (and disconnect the VPN) to test. If email then works, add Outlook as an exception in your security software and turn protection back on.

Can 365 Techies just fix this remotely?

Yes — this is a five-minute job for us. We connect securely with Splashtop SOS (you watch the whole session, we phone you first, and access ends the moment we finish), check every server setting for you and get your email flowing again the same day. Call 01202 775566.

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