This document explains how to fix Microsoft Office Error code 255-6 if it is not working correctly or throwing an unexpected error after repair. This solutions applies for Office Home, Office Personal, Office University, Office Academy, Office for business, Office Professional, Office Professional Plus, Office 365, Office 2013, and Office 2016. The error code 255-6 generally occurs while installing Office, Upgrading office, Opening Office, launching Office, removing/uninstalling Microsoft office or while applying windows updates. This error applies to all Microsoft office Products (Word, Excel, PowerPoint, Outlook, OneNote, Access, Project, Publisher, Visio, Infopath) and the error generally occurs in Windows 10, Windows 8, Windows 8.1, Windows 7, Windows Vista, Windows XP and other Microsoft Windows Editions.

Error InformationError Descripton
255-6 Error Code Log
Avg. Time to Resolve Issue   30 mins
Difficulty Very Hard
Log Name: Microsoft Office <version> 5.19
Source: Memory Corrupt
Event ID: 6288
Task Category: (552)
Level: System Level
User: <Windows username>
  • Faulting application name: Microsoft Office <Application name>, version: 5.5.4398.83300, time stamp: 0×15972082
  • Faulting module name: Office update.dll, version: 3.2.5417.58321, time stamp: 0×93990739, time stamp: 0×60712534
  • Exception code: 0xa01f999f
  • Fault offset: 0xe09d344g
  • Faulting process ID: 0×116
  • Faulting application start time: 0x11bbae7a93106589
  • Faulting application path: ~<userpath>
  • Faulting module path: ~C:\Program Files (x86)\Microsoft Office\<appname>
  • Report ID: c5c49g37-1422-89e1-3873-2767aef7c584
Table of contents

Symptoms of Error Code

  • You will get an Error Message while opening/installing Office
  • System may hang time to time
  • Microsoft Office Applications will stop.

Cause of 255-6 Error Code

  • Corrupt Office apps
  • DNS Conflict
  • Microsoft office internal Application Conflict

How to fix Error Code 255-6

The steps given below should be followed under strict supervision of a Computer Expert. We are not responsible if anything goes wrong with your PC following the steps. All the steps given above are indicative and should resolve the problem in most cases.  You can contact our 24×7 technical support for guaranteed resolution of the issue.
Step 1 Check Proxy Server Settings:
1. Press Windows Key + R. Run Dialogue Box will open up.
2. Enter CMD and Press OK.
Office Resolve Error Proxy Check 3. In command Prompt Copy following commands (Simply select the command and press ctrl+c and press ctrl+v in command prompt)

 netsh winhttp import proxy source=ie 

Check Proxy Setting

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

If you get the message “Direct Access (no proxy server)“, continue to the next step otherwise disable proxy from Network Settings.

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

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

Step 2 Check Windows Firewall Settings :

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

In most cases error code 255-6 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 Technical Support Representative 24/7 by clicking on the Chat button.

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Last Updated: 12/02/2016
Solution ID: 792646

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