How to Repair AuthHostProxy.dll? Download Now

Sometimes Windows system displays error messages regarding corrupted or missing AuthHostProxy.dll files. Situations like that can occur, for example, during a software installation process. Each software program requires certain resources, libraries, and source data to work properly. Corrupted or nonexistent AuthHostProxy.dll file can therefore effect in failed execution of the started process.

AuthHostProxy.dll file Web Authentication Host Proxy. The file was developed by for use with software. Here you will find detailed information about the file and instructions how to proceed in the event of AuthHostProxy.dll related errors on your device. You can also download AuthHostProxy.dll file compatible with Windows 10, Windows 8.1, Windows 8 devices which will (most probably) allow you to solve the problem.

For Windows Compatible with: Windows 10, Windows 8.1, Windows 8

File info

General information
Filename AuthHostProxy.dll
File extension DLL
Description Web Authentication Host Proxy
Program Microsoft® Windows® Operating System
Author Microsoft Corporation
MIME type application/octet-stream
File type Dynamic link library
System Windows NT 32-bit
Copyrights © Microsoft Corporation. All rights reserved.
Character set Unicode
Language cod English (U.S.)

There are various types of errors related to AuthHostProxy.dll file. AuthHostProxy.dll file may be located in wrong file directory on your device, may not be present in the system, or may be infected with malicious software and therefore not work correctly. Below is a list of most common error messages related to AuthHostProxy.dll file. If you encounter one listed below (or similar), please consider the following suggestions.

  • AuthHostProxy.dll is corrupted
  • AuthHostProxy.dll cannot be located
  • Runtime Error - AuthHostProxy.dll
  • AuthHostProxy.dll file error
  • AuthHostProxy.dll file cannot be loaded. Module was not found
  • cannot register AuthHostProxy.dll file:
  • AuthHostProxy.dll file could not be loaded
  • AuthHostProxy.dll file doesn't exist



Application could not be started because AuthHostProxy.dll file is missing. Reinstall the application to solve the problem.


Problems related to AuthHostProxy.dll can be addressed in various ways. Some methods are meant only for advanced users. If you don't have confidence in your skills, we suggest consulting a specialist. Fixing AuthHostProxy.dll file errors should be approached with utmost caution for any mistakes can result in unstable or unproperly working system. If you have the necassary skills, please proceed.

AuthHostProxy.dll file errors can be caused by various factors, so its is beneficial to try to fix them using various methods.

Step 1: Scan your computer for any malicious software

Virus Scan

Windows files are commonly attacked by malicious software that prevents them from working properly. First step in addressing problems with AuthHostProxy.dll file or any other Windows system files should be scanning the system for malicious software using an antivirus tool.

If by any chance you don't have any antivirus software installed on your system yet, you should do it immediately. Unprotected system is not only a source of file errors, but, more importantly, makes your system vulnerable to many dangers. If you don't know which antivirus tool to choose, consult this Wikipedia article – comparison of antivirus software.

Step 2: Update your system and drivers.

Windows Update

Installing relevant Microsoft Windows patches and updates may solve your problems related to AuthHostProxy.dll file. Use dedicated Windows tool to perform the update.

  1. Go to the Windows "Start" menu
  2. Type "Windows Update" in the search field
  3. Choose the appropriate software program (name may vary depending on your system version)
  4. Check if your system is up to date. If any unapplied updates are listed, install them immediately.
  5. After the update has been done,restart your computer in order to complete the process.

Beside updating the system, it is recommended that you install latest device drivers, as drivers can influence proper working of AuthHostProxy.dll or other system files. In order to do so, go to your computer or device producer's website where you will find information regarding latest driver updates.

Step 3: Use System File Checker (SFC) tool

System File Checker

System File Checker is a Microsoft Windows tool. As the name suggests, the tool is used for identyfing and addressing system file related errors, including those related to AuthHostProxy.dll file. After an error related to%fileextension% file has been discovered, the program attempts to automatically replace the AuthHostProxy.dll file with properly working version. To use the tool:

  1. Go to the Windows "Start" menu
  2. Type "cmd" in the search field
  3. Locate "Command Prompt" result – don't run it yet:
  4. Click the right mouse button and select "Run as Administrator" option
  5. Type "sfc /scannow" in console prompt to start the program and follow the instructions

Step 4: Restoring Windows system

Windows Recovery

Another approach is to restore system to previous state, before the AuthHostProxy.dll file error occured. In order to restore your system, follow the instructions below

  1. Go to the Windows "Start" menu
  2. Type "System Restore" in the search field
  3. Start the system restore tool – it's name may differ depending on version of the system
  4. The application will guide you through the process – read the messages carefully
  5. After the process has finished, restart your computer.

If all the above-mentioned methods failed and the AuthHostProxy.dll file problem has not been resolved, proceed to the next step. Remember that the following steps are intended only for advanced users.

Download and replace AuthHostProxy.dll file

The last solution is to manually download and replace AuthHostProxy.dll file in appropriate folder on the disk. Select file version compatible with your operating system and click the "Download" button. Next, go to your web browser's "Downloaded" folder and copy the downloaded AuthHostProxy.dll file.

Go to the folder where the file should be located and paste the downloaded file. Below is the list of AuthHostProxy.dll file example directory paths.

  • Windows 10: C:\Windows\System32\
  • Windows 8.1: C:\Windows\System32\
  • Windows 8: 1: C:\Windows\System32\

If the steps did not solve your AuthHostProxy.dll file problem, you should consult a professional. A probability exists that the error(s) might be device-related and therefore should be resolved at the hardware level. A fresh operating system installation might be necessary – a faulty system installation process can result in data loss.

File versions list

Filename AuthHostProxy.dll
System Windows 10
File size 11776 bytes
Date 2017-03-18
File details
MD5 f570958145572785d7f8ed4d5e53a4c5
SHA1 c5290d6974bb373e449d10d90e89873850bf5019
SHA256 3e3393ec5faf431e040d35ebca64a11aece5d176bac537eb008bf39ac392799d
CRC32 0429350a
Example file location C:\Windows\System32\
Filename AuthHostProxy.dll
System Windows 8.1
File size 11776 bytes
Date 2014-11-21
File details
MD5 e018a6b8b0b54075dd61624b0a5162f1
SHA1 0adc456197b7e38e17c871e3278a8f4e33e3796f
SHA256 c02824ecdfbdc635865ee365eff653c8e3e78ed13bd32277af0967e4cfe9e30e
CRC32 f0c581e3
Example file location C:\Windows\System32\
Filename AuthHostProxy.dll
System Windows 8
File size 10240 bytes
Date 2012-07-26
File details
MD5 78c65fbaa5f27ae14f8b4c4bda215855
SHA1 e71eef711a5ee07c67884616a0a0ade5f00cce1f
SHA256 5b799f21f18355f7bb905b86d4fd8a245a949f4445435763d400624e043c372b
CRC32 a10eafee
Example file location 1: C:\Windows\System32\