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Error 1747 : The Authentication Service is Unknown in Vista

Yesterday I encountered a strange error with Windows Vista laptop while troubleshooting WiFi connectivity problems. We were at a public hotspot but his laptop failed to join the network. It displayed a message Windows cannot find wireless networks. While opening Dell Wireless utility, it shows the status of the Dell adapter as disabled. However, in Device manager, it shows the device is working properly. A possible issue might be with Wireless Zero Configuration service. For Vista and later versions, WLAN AutoConfig is doing the same function. We accessed the services page and found the specific service in the stopped state. We pressed the button start but it failed with a strange error. It is given below.

Service cannot be started Error 1747: The Authentication Service is Unknown

Though it was the first time I encountered such an error, we fixed it quickly. This tutorial explains how to deal with the error Service cannot be started Error 1747: The Authentication Service is Unknown and solves it quickly.

Troubleshooting steps
  1. Make sure the Wireless button on the laptop is ON

  2. Check Firewall settings

    Faulty settings on the Firewall installed on your computer may prevent it from accessing the Internet. So for troubleshooting purpose, we need to disable it.

  3. Services must be running with full permissions

    It is important to make sure the services are running on the PC with full permissions. To verify it, follow the registry path and make sure your current user has full permissions.


  4. Try Windows Socket reset

    To do it, type the following command on DOS prompt and press enter.

    netsh winsock reset

    To go with advanced Windows Socket permissions follow the registry.



    Right click on the registry entry and click on permissions. Make sure that Winsock and Winsock2 have full permissions. Before testing with Registry, I recommend you to read the article provided below by visiting the link.
    How to Backup Registry

  5. Perform clean boot

    While clean boot, check if any third party software is causing the issue or not. If any third party is causing the issue try the system restore to a date before the date when that particular software installed. To do it, I suggest you follow the instructions provided in the link below.
    How to Perform Clean Boot

  6. System Restore

    Does System Restore to a day when the wireless was working(Before the error 1747)? If still the issue persists we need to perform the final parts of solutions.
    System Restore Lessons

  7. Run Windows Update

    If you are using Windows Vista on your computer, upgrade it to Windows Vista SP1. Even if the issue persists we need to reinstall the OS on your computer. So the last resort is:

  8. Reinstall Windows Vista on your computer.

  1. How to Access Services Window

  2. PING: Transmit failed. General Failure


Anonymous said…
Lol... you rock. Permissions to services did the trick. Where to learn how to tweak the registry ?
Alex George said…
It is happy to know that your issue is fixed. Always careful while tweaking with registry :)
Anonymous said…
Great! netsh winsock reset did it for me. Thanks, you spared me a lot of pain :)
*Moonlight* said…
Thanks! thanks a lot!
you´re a genoious!!
Anonymous said…
Thanks a lot. Your post prevented a lot of frustration and loss of entire day.
Anonymous said…
This worked for me as well. Something else that i noticed was that, Under HKEY_LOCAL_MACHINE->System->CurrentControlSet->Services->EventLog (Right click on EventLog and select Permissions), I noticed that an unauthorized user account got created automatically and I went and deleted it. I think that must have helped as well.
Anonymous said…
This fixed the problem which I had. Thank you
Unknown said…
You are a superhero. Was about to put this machine in a trash compactor. Thank you!
Unknown said…
Thanks, I was having problems with a wireless adapter and the system restore to a previous date solved it.

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Alex George
Alex George has Engineering graduation in Computer Science and an MBA in Finance. He had been working as a senior Network Engineer for ten years. His specialization is in Cisco products. Traveling is one of his hobbies and visited various places as part of his onsite work. He visited different places as part of his onsite work like New York, Dubai, London, etc. Right now Alex is a director of one of the leading career development firms in India, which trains students for UPSC, SSC, and PSC examinations. He guides a lot of students to get selection for various prestigious institutions like CBI, Income Tax Department, etc. Alex George is a stock market investor and a very active intraday trader. Engineering Background: He has a B.Tech in Computer Science and Engineering and passed different network and security courses like CCNA, CCNP (Security), CEH, and various Microsoft certifications. Finance Background: Alex has an MBA in Finance. He is an active intraday trader and a Share Market Investor. Webmaster Skills: Alex is a blogger since 2004. He has a working knowledge of HTML, CSS, PHP, and JavaScrip.