Steps To Resolve Outlook Error 0x800ccc0b


Microsoft Outlook is a popular email client basically used for sending or receiving emails. Apart from this, Outlook comes with several advance features which helps the user to manage your day to day task with ease. This application comes with advance features such as Calendar items, Notes, Journals, Contacts, Emails, Task etc. Outlook not only helps the user in their work but also helps in managing things like events, appointments etc. However, Outlook user faces some unknown issues due to corruption of PST files or some other reason. In this post, you will get to know about Outlook error 0x800ccc0b and guidelines to fix this error.

Let’s suppose you are using Outlook and trying to send email messages but during this process you get sending failure error message which get triggered by Outlook in this form :

  • Task ‘machine.domain.xom – Sending and Receiving’ reported error (0x800CCC0B) :’Unknown Error 0x800CCC0B’
  • Task Sending and Receiving’ reported error (0x800CCC0B):’Unknown Error 0x800CCC0B’
  • Error Message: An unknown error has occurred. Account: ‘’, Server: ‘’, Protocol: SMTP, Port: 25, Secure (SSL): No, Error Number: 0x800CCC0B

Normally, this type of error message occurs due to two main reasons :

  • Due to corruption in Registry files
  • If Outlook PST got damaged

Other reasons responsible for Outlook error 0x800ccc0b are :

  1. Improper installation of Outlook Express
  2. Virus or malware attack
  3. Misconfiguration of Outlook account
  4. Abrupt system shutdown
  5. Over-Sized PST file or PST file size limitation

Try Manual Steps To Fix Outlook error 0x800ccc0b

  1. Launch Outlook Express
  2. Go to Tools section → select Accounts
  3. Choose the account you are using currently and click OK
  4. Move to servers tab and click on Outgoing Mail Server
  5. Make sure that the option Server Requires Authentication has marked
  6. Click OK to finish the process
  7. After completing this process, try to send an email message

If the above manual method failed to resolve the Outlook error message then it is highly recommended to make use of “PST Repair Tool” which is reliable and robust. With the help of this tool you can easily resolve Outlook error 0x800ccc0b and also rectify other errors of MS Outlook.

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