This document explains how to fix Microsoft Outlook error 0x80040900 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
-An unknown error occurred ,error code ox80040900
– send/receive could not connect to POP mail server
– 0x80040900- server name cannot be found on network

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 0x80040900 Outlook Overview
Total Incidents Recorded 869658
Issues Resolved (Percentage) 95%
Also Known as

Outlook fehler code 0x80040900, foutcode 0x80040900, fejlkode 0x80040900, code d’erreur 0x80040900, codice di errore 0x80040900, feil kode 0x80040900, cod de eroare 0x80040900, código de error 0x80040900

0x80040900 Error Code Log
Avg. Time to Resolve Issue   45 mins
Difficulty Hard
Log Name: Microsoft Outlook <version> 9.65
Source: Application Conflict
Event ID: 5611
Operating System
  • Windows 7
  • Windows 8
  • Windows 10
Level: Administrator
User: <Outlook username>
  • Faulting Application Name: Microsoft Outlook <Application name>, version: 5.9.7404.60761, time stamp: 0×55013596
  • Faulting module name: Outlook  event.dll, version: 8.9.8589.51496
  • Exception code: 0xe01f802d
  • Fault offset: 0xe07a194c
  • Faulting process ID: 0×715
  • Faulting application start time: 0x18ecee2d01640363
  • Faulting application path: ~<userpath>
  • Faulting module path: ~C:\Program Files (x86)\Microsoft Outlook\<appname>
  • Report ID: b1b92e32-9948-76g4-4928-3318fdb4b959

Cause of 0x80040900 Outlook Error Code

  • Proxy issue
  • Junk files location is infected with active malware

Steps to resolve Outlook Error Code 0x80040900

Step 1: Check for system corruption:
1. Press Windows Key + R. Run Dialogue Box will open up.
2. Enter CMD and Press OK.
open command prompt3. In command Prompt Copy following commands (Simply select the command and press 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. 

Step 2:

Verify Windows Firewall Settings :

1. In Start Search box type “Firewall.cpl” (without quotes)
Open Windows Firewall2. Click on Windows Firewall.
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 Outlook error 0x80040900 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: 22/01/2016
Solution ID: 323113

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  • April 7th, 2016

    Posted In: Microsoft Outlook

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