Expired certificate

[Tbe142]

I can not print do to an expired root certificate NP15402CD on a laser jet printer.  How can I get a new certificate?

[VikramTheGreat · Accepted solution]

Hi @Tbe142,

Welcome to the HP Support Community.
 

Thank you for posting your query. I will be glad to help you.

It can feel really frustrating when a printer you've trusted suddenly halts your workflow because of an expired certificate. You're not alone; this is a common hiccup with HP LaserJet printers. But the good news? There's a simple fix that brings your printer right back up.

How to Renew the Certificate

1. Access Your Printer’s Web Interface

• Find your printer’s IP address (from the printer menu or HP Smart).
• On your computer, open a browser and go to: 
• http://<Printer_IP>
• You might see a warning like “Connection Not Secure.” Choose to Proceed or Continue; it’s safe since it's your printer.

2. Generate a New Self‑Signed Certificate

• Visit Network or Networking → Certificates (sometimes under Security → Certificates).
• Click View to confirm the old certificate has expired.
• Go back and click Configure (or Create New).
• Choose Self‑Signed Certificate, set the validity for 3650 days (10 years), and click Apply.
• The printer may take a few minutes to apply the new certificate.

3. (Optional) Confirm Date & Time

• If your printer’s clock is incorrect, it may treat a valid certificate as expired.
• Navigate to Settings → General Settings → Date & Time and ensure they are accurate.

4. Restart and Reconnect

• Reboot the printer to load the new certificate.
• On your computer (especially Macs), delete and re-add the printer under your printers list. This ensures it recognizes the new certificate and resumes printing.

I hope this helps.

Take care and have an amazing day!
 

Did we resolve the issue? If yes, please consider marking this post as "Accepted Solution" and click "Yes" to give us a helpful vote - your feedback keeps us going!

Regards,

VikramTheGreat

[Tbe142]

I was able to uninstall and reinstall the printer and now I am able to print!!  Thank you for your support. 

[VikramTheGreat]

Hi @Tbe142,

That’s great news! 😊

I’m really glad to hear that uninstalling and reinstalling the printer resolved the issue and you’re able to print again.
 

You’re very welcome, it was a pleasure supporting you. If you need any further help in the future, please don’t hesitate to reach out. Happy printing!

Take care and have an amazing day!
 

Did we resolve the issue? If yes, please consider marking this post as "Accepted Solution" and click "Yes" to give us a helpful vote - your feedback keeps us going!

Regards,

VikramTheGreat

[Tbe142]

He was able to walk me through getting my printer to print again because of an expired certificate!!!! Several other "experts" could not resolve the problem!!!