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error 401?

Adam Pettit

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Getting error 401 every time i open nitro pdf.  I'm on version Nitro Pro  Is there any way this can be fixed without having to pay to upgrade to Nitro Pro 13?


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  • Official Nitronaut
Reymund Oyong

Greetings @Adam Pettit

Thank you for reaching out to us through our Community Forums!

I understand that you are getting a 401 error when opening Nitro Pro. Please try the following and see if it fixes the error message:

1. Open your Nitro PDF Pro then close the 401 error message if it shows up. 
2. At the top right, click the Logout then close Nitro Pro.
3. Open Nitro PDF Pro then click the Login button and login using your Nitro Sign account.

If the error 401 persists, I recommend to update your Nitro PDF Pro 12 to the latest build which is
Please be aware that we no longer support early builds of Nitro Pro 12 or earlier versions (version 11 and older) and those activation servers have been shut down. It is highly recommended to update to the latest build of version 12 (

The Nitro PDF Pro installer can be located from the following location: 
https://www.gonitro.com/product-details/downloads - click the 'Download Nitro Pro 12' link. 

Kind regards,

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  • 8 months later...

To resolve the "Error 401" in Nitro Pro 12:

  1. Check your internet connection.
  2. Restart Nitro Pro.
  3. Re-enter your license information.
  4. Deactivate and reactivate your license.
  5. Contact Nitro Pro support if the issue persists.
  6. Ensure your software is up to date.
  7. As a last resort, consider clearing the license cache (advanced).

Upgrading to Nitro Pro 13 is not the only solution; try these steps first.

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