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Error 401 with Nitro Pro 12.14

David Larchez

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David Larchez


I'm having the same error 401 code every time I open a PDF for the last month or so. I sent you a private message with a screenshot of your 'About Nitro Pro' window under Help tab. I aslo sent you my serial number. Thank you.

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  • Official Nitronaut
Allain Umailin

Hello @David Larchez,

Thank you for reaching out to us through our Community Forums and our sincere apologies for this inconvenience.

To further assist you, let us try some troubleshooting by referring to these steps:

1. Open your Nitro Pro and log out from your Nitro Sign by clicking the drop-down arrow and selecting Logout. This should be below the 'X' Close button of your program.

2. Clear the content of the directory under C:\users\your_username\Appdata\local\temp. For whatever reason, not all temp files automatically remove themselves and is NOT usually caused by Nitro Pro files. Kindly note Appdata folder is hidden and to unhide it, please refer to this article https://cybertext.wordpress.com/2012/05/29/cant-see-the-appdata-folder/ 

3. Download and run our Clean Up utility to uninstall your Nitro Pro:  http://install.nitropdf.com/professional_12169574/install-cleanup/install-cleanup.zip 

NOTE: This clean-up tool will erase any existing signature files within Nitro so please save them to another location before using the clean-up tool in order to keep them. Please see this link for backing up custom stamps/signatures: https://kb.gonitro.com/knowledgebase#/search/stamps/000004307 

4. Clear all your downloads folder or delete all downloaded Nitro installers. This step is important because we noticed that if you are saving all the installers and you download them in the same folder (like the downloads folder), the EXE can pick up any MSI installer in that folder and you may pick-up one of the older builds instead of the newly downloaded package.

5. Download and install Nitro Pro 12.16.9 using below offline installers:

x32 http://install.nitropdf.com/professional_12169574/en/retail/nitro_pro12_ba_x86.msi 
x64 http://install.nitropdf.com/professional_12169574/en/retail/nitro_pro12_ba_x64.msi

To know if you have 32-bit or 64-bit, please refer to this article:  https://support.microsoft.com/en-ph/help/15056/windows-32-64-bit-faq 

6. After installation, you can activate by opening Nitro Pro, clicking on the Help tab > About Nitro Pro > Activate by entering your serial number

7. Reset your Nitro Sign password, login back to Nitro Sign by clicking 'Log In' button.

If the error message reoccurs after a day or two, please let us know by replying to this thread so we can further investigate.

Thank you for choosing Nitro and stay safe always.

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  • 2 weeks later...
Richard Koffler

Don't waste your time with all the uninstall reinstall hassle. Just log out and problem solved. As suspected, this is their (awfully buggy, primitive, hyper intrusive, upsell or die) cloud service

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