4 Solutions to Resolve Error 0x800ccc78

4 Solutions to Resolve Outlook Error 0x800ccc78

0x800ccc78, an error message usually comes out as "unknown error" tag, making it look difficult to repair or even diagnose.

Wondershare Recoverit Authors

Oct 13, 2020 • Filed to: Recover & Repair Emails • Proven solutions


0x800ccc78, an error message usually comes out as an "unknown error" tag, making it look difficult to repair or even diagnose. It is one of the most common errors users face when they are about sending a message out on Outlook. If you are facing this problem, nothing is wrong with your internet or computer.

Just like most software issues and bugs, this error is quite easy to fix. Most times, all you need to do is change some simple settings in your Outlook to get it working again and eliminate the error.

There are many ways through which you can resolve error 0x800ccc78.

What does Error 0X800CCC78 in Microsoft Outlook Look Like?

This is an error that pops up when using Outlook in Microsoft Office suite

Also called Outlook receiving and sending an error, it is a frequent error in Windows and all software adaptable to windows. It occurs when sending messages or emails in Outlook.

So many times when you get the error alert "Please verify the email address in account properties" and "Outlook is not currently configured to authenticate when sending emails" and others. However, this error doesn't affect incoming messages when you are on Outlook; you can receive emails but unable to send.

Why you are getting the error

Internet Service Providers or ISP provides the values of the port for synchronization of data on a domain, through which data transmission and reception are made possible. Also, to send emails from Outlook, some ports are used - port 25, in particular, is the default and is the most accessible port number. Error 0x800CCC78 in Outlook is caused when your internet service provider blocked the port and changed it to another one; 587.

Method 1. Configure your SMTP Server

To use this method, open up your Outlook the usual way you do, if the error popped up while it was running, close your Outlook and restart it to continue this method.

4 Solutions to Resolve Error 0x800ccc78

Step 1: Click on File. This is at the top of the program banner. Now click on the resulting "account settings" in the drop-down menu. You may need to click the file, then info to see account settings in some versions of Outlook.

Step 2: Click the email tab under account settings. After clicking the email tab, your email address would appear.

Step 3: Double click on your email. After double-clicking on your email, new windows would pop up, now click on outgoing to go to the right setting.

Step 4: Check your Outgoing Settings: Here, you need to ensure two of the settings are set properly. Two of these settings are important and must be checked so Outlook can work properly. Check the following boxes

  1. "My outgoing server (SMTP) requires authentication."
  2. Click the bubble named "Use same settings as incoming mail server" or if you have that option missing, simply ensure the information on outgoing and incoming mail server are the same.

Step 5: Now click on, ok. Go back to your email after clicking ok. Please do not test account settings. This won't work and can undo some settings. Click Finish and then close to leaving account settings.

Note: Some versions of Outlook may look slightly worded. Just ensure you don't click "cancel".

Step 6: Restart Outlook and then try sending an email. Now after restarting your Outlook, try to send out a message and see if the error shows again. If the error comes up back, try moving to the next method.

Method 2. Change Port Number to 587

Another method of resolving error 0x800ccc78 when sending emails in Outlook is by changing the port number has been changed by ISP. You can change the port number by following the steps below

Step 1: Start your Outlook. Click tools and go to Account Settings.

Step 2: Under account settings, click the change button. Go to more setting under add new email account. Click on the tab, labeled "Advanced."

Step 3: Go to the port numbers of SMTP and IMAP, set 587 as the port number for SMTP (Outgoing server). Now click, Ok. Click on Next and then the finish button.

Step 4: Close your outlook application and restart it. Try sending a message and see if it works. If the error pops up again, move to the next method.

Method 3. Repair PST File

One easy to use tool that repairs the PST file header while also deleting data it cannot understand or recognize from the file. It is an old and still useful Microsoft tool.

This tool can be found in all versions of Windows from 2000 and XP. It is located in the directory below:

C:\Program Files\Common Files\System\Mapi\1033\NT

In-Office 2007, you can find it C:\Program Files\Microsoft Office\Office12\)

If for one reason or another you can't find it in the above directory, go to start in your windows and do a search for scanpst.exe. Alternatively, you go to the Microsoft website and download the inbox repair tool. After downloading, it should run automatically.

Now go to browse and select the corrupted PST file. If you are certain where the PST file is stored, you can look in the directory below.

C:\Documents and Settings\username\Local Settings\Application Data\Microsoft\Outlook

After choosing the PST file, click on the start button.

After its completion, the program will pop up the errors inside your PST file. Now click on repair to start the repairing of your file.

After it is completed, it will tell you the errors found in your PST file. Go ahead and click on repair now to begin the repair of the file.

After restarting your Outlook, the application should normally be working, and you will see your emails inside it. You should try sending emails and see if it works. If you are still getting errors, go to the next method. This tool can be also be used to repair OST files.

Method 4. One-stop solution: Stellar Outlook Repair

This method shows how to fix your Outlook and repair your PST file using Stellar Phoenix Outlook PST Repair.

Stellar Repair for Outlook is a unique PST repair tool for instant restoration of broken PST files with 100% precision and integrity. It has a powerful scan engine that can reconstruct and repair badly damaged PST files of any size to retract data including deleted contacts and emails in your existing or new Outlook profile.

Step 1: Click "Find Outlook File' options to begin the repair process. This adds the PST file.

Step 2: Now click on the "Look in' option after selecting the drive folder where the corrupted PST files are located.

Select all damaged PST files to begin scanning; you need to click on 'Start'. The tool will now successfully repair your files.

Step 3: You need to click on any file you want from the tree on the left. Now restart your outlook application. You can now send emails and receive them with ease on your application.


Only a few PST repair tools on the internet can perform quite extraordinarily like Stellar Phoenix Outlook PST Repair. The several impressive features this tool has makes it the best software to repair your damaged PST file.

Some fantastic feature of this incredible software are:

It recovers all components of the mailbox components such as contacts, journals, emails, notes, attachments, and calendar items.

Can recover your accidentally deleted emails which you might have mistakenly deleted or lost due to improper formatting.

Stellar Phoenix Repair Tool allows users to save recovered emails in MSG, RTF, HTML,

Allows the saving recovered mails in EML, MSG, RTF, HTML, and PDF formats

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