Error Code 0x800CCC0E

Marilyn Hood 0 Reputation points
2026-09-30T18:42:03.04+00:00

Unable to connect to server. Error code 0x800CCC0E

Windows for home | Other | Email and communications
0 comments

2 answers

Sort by: Oldest
Most helpful Newest Oldest

  1. AI answer

    2026-09-30T18:42:17.63+00:00

    Error 0x800CCC0E in Outlook means Outlook cannot connect to the mail server.

    For this error, use these checks and fixes:

    1. If the account is Gmail or Yahoo in classic Outlook
      • A known issue affected Gmail and Yahoo accounts and could also happen after a password change.
      • Close Outlook.
      • Open Credential Manager from the Windows Start menu.
      • Go to Manage your credentials > Windows Credentials.
      • Under Generic credentials, find entries that start with MicrosoftOffice16_Data:OAUTH2 and remove the relevant ones.
      • Reopen Outlook and sign in again when prompted.
      • After a password change, Outlook may not prompt immediately; it can take about one hour for the OAuth token to expire.
    2. If the account uses IMAP or POP and the connection was interrupted
      • The issue can be caused by an invalid App Password.
      • Sign in to the email provider’s webmail, go to Account Information > Security, and create a new App Password.
      • In Outlook, go to File > Account Information > select the affected IMAP account > Account Settings > Server Settings.
      • Paste the new App Password into the Password box, then select Next and Done.
    3. Check for third-party add-ins
      • Start Outlook in safe mode: Start > Run > type outlook.exe /safe > OK.
      • If Outlook works in safe mode, disable third-party COM add-ins:
        • File > Options > Add-Ins
        • In Manage, select COM Add-ins > Go
        • Clear the check boxes for third-party add-ins
        • Restart Outlook
    4. Windows 10 only: TLS 1.3 workaround for IMAP/POP interruptions
      • This is a registry change and should be done carefully.
      • Open Regedit and go to: Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols
      • If TLS 1.3 exists under Protocols, first export the key as a backup.
      • Delete the TLS 1.3 key and its subkeys.
      • Restart Outlook. If mail still does not sync, restart Windows.

    If the error is specifically with Gmail or Yahoo, the Credential Manager fix is the primary workaround.

    AI-generated content may be incorrect. Read our transparency notes for more information.

    Was this answer helpful?

  2. Clary-N 16,565 Reputation points Microsoft External Staff Moderator
    2026-10-01T00:18:19.79+00:00

    Hi Marilyn Hood,

    Thanks for sharing the error details. To narrow this down, could you confirm which email provider you’re using, which version of Outlook you have and whether the problem affects sending, receiving or both? Also, can you access the account and send or receive messages normally through webmail?

    If webmail works, make sure Work Offline isn’t enabled in Outlook, then install any available Office updates and try repairing the account under File > Account Settings > Account Settings > Email > Repair. If Repair isn’t available or the error continues, please let me know what happens when you test on another network, such as a mobile hotspot. This can help determine whether the connection is being blocked by the current network, VPN, firewall or security software.

    Please let me know what happens after these checks and I’ll help you narrow down the next step.

    Was this answer helpful?

Your answer

Answers can be marked as 'Accepted' by the question author and 'Recommended' by moderators, which helps users know the answer solved the author's problem.