4 Effective Ways to Fix Outlook Error 0x800ccc78

Published On - November 17, 2023 by Armaan | Reading Time: 3 minutes

Summary: Yesterday, I was sending an email to a client, and suddenly, I saw the error on the screen, which was 0x800ccc78. After looking for many ways to resolve the error, I could not get a satisfactory resolution. What to do next?

We have seen many users asking these questions, so in this article, we will help you fix the issue of the 0x800ccc78 error in just a few clicks. However, if these methods cannot help you, then try the Regain Outlook PST Recovery tool to repair your corrupted PST files.

0x800ccc78 is the error that pops up due to some issues in our system. It always comes out as an unknown error, and that makes it difficult to diagnose and repair. Here, we have mentioned 4 methods to resolve this error. Please have a look at this article, which will boost your knowledge and provide you insight into how to resolve this error.

Reasons behind the Outlook error 0x800ccc78

Error 0x800ccc78 is caused when your Internet Service Provider blocks the port and changes to another one. This port is essential for the transmission of data. The data transmission and reception are possible only with the help of this provider. Many times, corrupt PST files can also be responsible for the blocking the port. Let us explore the ways how to fix this issue.

4 Extraordinary Methods to Fix error 0x800ccc78

Here we will try to discuss the four most feasible solutions for fixing this error. Let us discuss them one by one.

Method 1: Change the SMTP Server’s connection and authentication Settings.

When your SMTP Server’s connection is terrible, you can face the 0x800ccc78 error while sending emails to other recipients. Follow these steps to set up the SMTP Server connection and authentication Settings.

Step1: Open Outlook, hit the File option, and go to Account > Account Settings. Fix Outlook Error 0x800ccc78

Step2: Double-click on the email account, then tap on More Settings.Repair Outlook error 0x800ccc78

Step3: Tap on the Outgoing Server and select My outgoing server (SMTP), which requires authentication through Use same settings as my incoming mail server.step 3

Step4: Choose the Advanced option and type port number 587 for the SMTP server. After that, choose Auto or the TLS encryption, then tap on Done. free guide to fix Error 0x800ccc78

Step5: Test your account, and if it’s working, your error is resolved. step 5

Method 2: Check the Recipient’s Address.

In this step, if a user types the email address wrong, then there will be an error showing x800CCC78. The user should double-check the recipient’s email address. The user needs to ensure that the email address is valid and does not cover any unrecognized characters.

Method 3: Repair PST files

We already mentioned above that corrupt PST files can be the reason behind error 0x800ccc78. As a result, one must definitely consider repairing these damaged files. The PST files can be repaired with the help of SCANPST.EXE which is an inbuilt repair tool. Here are the steps that you need to follow for this process.

  1. Go to Start in your windows. Search for SCANPST.EXE.
  2. The location of the file will open.
  3. Now, double-click on the tool to activate it.
  4. Click on Browse to search for the corrupt PST file.
  5. Once you have chosen the PST file, click on Start.
  6. The tool will begin its process to detect the issues with the corrupt file.
  7. Once all the errors have been found, click on Repair.
  8. Restart MS Outlook to see if the error has been fixed.

Method 4: Repair the PST file using an automated tool.

This is the last method; I would like to introduce you to a tool that helps you do this difficult task very smoothly, introducing Regain Outlook PST Recovery. This tool serves multiple purposes and ensures that the whole process is smooth and error-free, resulting in no loss of data. It is also capable of restoring and recovering deleted or lost Outlook emails and email items. Software also compatible with various versions of MS Outlook, like 2019, 2016, 2013, and lower versions.

Free Download100% Secure Buy NowPrice: $39

This automatic tool comes with an easy interface for beginners. This tool helps to instantly repair the damaged files without distorting the structure of the files and the data. This helps to retain the integrity of data.


In this article, we tried to help you gain knowledge of various methods to fix the 0x800ccc78 error. Experts best know the methods mentioned above. The tool Regain Outlook PST Recovery stands above all and serves multiple purposes, making it a suitable choice. It reduces the chances of error and is also capable of restoring deleted emails and email items, making us worry-free.


Author: Armaan

Hello I have been working in Regain Software for the last 6 months. I have been in the field of writing for many years and worked with many Data recovery companies. Here I am writing technical blogs, Software User Guides and manual methods for email conversion and cloud migration. Now, working on all products of our company. Thanks you

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