30174-40 Office 365

30174-40 Error Code Office 365 Overview
Difficulty LevelHigh
Resolution:DLL Issue
Cause:Malwares/Virus
Affected Operating Systems
  • Windows 8/8.1
  • Windows 7
  • Windows 10
  • Windows Vista

How To Fix 30174-40 Error Code in Office 365

Repair Difficulty : Medium

Step 1: Disable Microsoft Windows Firewall

For Windows 7 and later

1) Press “Windows Key + R” and Type “Firewall.cpl” and Press Enter.
Office Error Code 30174-40 Office 365 img7
2) Windows Firewall Window will Open.
3) Click On “Turn Windows Firewall on or off”
Office Error Code 30174-40 Office 365 img7
Warning: If you are logged in as Normal user you may be asked to enter Admin Password
Office Error Code 30174-40 Office 365 img5
4) Turn Off Windows Firewall and Press “OK” Button.

Warning: You can activate Windows Firewall after Office 365 installation is complete.

Step 2: Proxy Issue

1) Goto Control Panel.
Windows 7 : Click Start and then Click On Control Panel from Right Pane.
Microsoft Windows 8 : Press Windows Key + Q and Type “Control” And Click on it.
2) In Search Box Type Internet and Click on “Internet Options”.
3) Click On Connections Tab and then Choose LAN Setting.
Office Error Code 30174-40 Office 365 img 11
4) Turn off “Use a proxy server for your LAN” if its already ON.

Step 3: Check System Integrity

1) Press Win + R
Office Error Code 30174-40 Office 365 img14
2) Type cmd and Press Enter.
Office Error Code 30174-40 Office 365
3) Type “sfc /scannow” and press enter.
Office Error Code 30174-40 Office 365 img18
Note: You will need Admin rights to run the sfc command.

Step 4: Try the installation again

In most case 30174-40 error code in Office 365 should be resolved by now, if however the problem still persists please get your system checked by an expert.

If you are not able to resolve the issue following above steps, you can contact our 24×7 Chat Support for help.

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  • January 1st, 1970

    Posted In: Office 365

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