This document explains how to fix Microsoft Outlook error 0x800CCC78 if it is not working properly or throwing an error while installing, updating,  launching/opening, performing action like sending or receiving emails, configuring emails etc.

The error message may look like:

  • (0x800CCC78) Cannot send the message. Verify the email address in your account properties. The server responded:550 user (Your Email ID) has exceeded their send quota.
  • Sending reported error (0x800CCC78) : Cannot Send the Message. Verify the e-mail address in your account properties. The server responded

This solutions applies for following version of Microsoft Outlook:

  • Outlook 2007
  • Outlook 2010
  • Outlook 2013
  • Outlook 365
  • Outlook 2016
  • Microsoft Office (2013/365/2016)
Error InformationError Descripton
Error 0x800CCC78 Outlook Overview
0x800CCC78 Error Code Log
Avg. Time to Resolve Issue   40 mins
Difficulty Very Hard
Log Name: Microsoft Outlook <version> 8.57
Source: DNS Error
Event ID: 1329
Operating System
  • Windows 7
  • Windows 8
  • Windows 10
Level: System Level
User: <Outlook username>
Description:
  • Faulting Application Name: Microsoft Outlook <Application name>, version: 8.9.9869.25068, time stamp: 0×19950203
  • Faulting module name: Outlook  event.dll, version: 7.8.4903.50381
  • Exception code: 0xb06g559d
  • Fault offset: 0xd03b075f
  • Faulting process ID: 0×318
  • Faulting application start time: 0x12fdga2e90690433
  • Faulting application path: ~<userpath>
  • Faulting module path: ~C:\Program Files (x86)\Microsoft Outlook\<appname>
  • Report ID: c7a85e15-2512-44a9-7184-2182dcf8c577

Cause of 0x800CCC78 Outlook Error Code

  • Outgoing connection blocked due to conflicting application.
  • Corrupt Outlook Settings

How to Resolve Outlook Error Code 0x800CCC78

Step 1: Disable Windows Firewall Temporarily :

1. Hold Windows Key + R. Run Dialogue Box will open up.
2. Enter Firewall.cpl and Press OK.

3. Click on “Turn Windows Firewall On or Off
Turn Windows Firewall on or off4. In Private network Setting, select “Turn off Windows firewall (not recommended)
5. Do the same for Public Network Setting.
Disable Windows Firewall6. Press OK.
Note: After the issue is resolved you must turn the Windows Firewall on.

Step 2: Check for corrupt system files:
1. Hold Win Key + R. Run Dialogue Box will open up.
2. Enter CMD and Click OK.
open command prompt3. In command Prompt Copy following commands (Simply select the command and hold Ctrl+C and press Ctrl+V in command prompt)

 sfc /scannow 

sfc scannow
The system will take some time to check. Let it run for a while. If it finds any issues in “operating system” integrity it will automatically fix it.

Note: You will need Administrator Access to Run the above command. Simply Right Click on cmd button and select “Run as Administrator

 You can contact our 24×7 customer Live Technician for any help during the whole process. 

In most cases Outlook error 0x800CCC78 should be resolved by following above steps. If however the issue still persists it means there is some critical issue with your system which needs to be fixed manually and is recommended to be done by an experienced Computer Technician.

You can chat one-on-one with one of our Outlook Support Representative 24/7 by clicking on the Chat button.

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Last Updated: 27/01/2016
Solution ID: 764363

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