Shared Kyocera printer gives certificate error on just one of several client Macs.

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Level 1

23 points

Shared Kyocera printer gives certificate error on just one of several client Macs.

I have Kyocera Ecosys P5026cdw attached to a Mac mini and shared on my LAN to 3 client Macs. The printer's certiificate recently expired, and one of the client Macs then stopped printing to that printer, giving an error explaining that the certificate expiry. The other two clients continue to print without difficulty. I created a new certificate on the printer, but that one client Mac remains unable to print to it, stubbornly giving that same error about an invalid certificate. In attempting to fix this, I have deleted and recreated the printer (many times!) on that client, and updated the Kyocera printer driver, all to no avail.

Note that the printer itself does not display any errors, and on the print-server Mac (and the two problem-free client Macs), the shared printer continues to show as Ready (with a green dot). It is only on the one client Mac that the printer shows as paused with an error condition (Red dot). Unpausing the printer is quickly reversed

This shared printer setup has been running and stable since 2019 (and since before then with a different printer), though with hardware replacements from older, Intel, MacBooks for 2 of the clients, and MacOS updates and upgrades for all machines concerned. The print-serving Mac Mini is running Monterey 12.7.6 (it's an old Intel Mac at its update limit). The Client Macs (2 x M1 MacBook Air, 1 x m4 Mac Mini) are all running Tahoe 26.1. The client Mac displaying the problem is one of the MacBooks.

Mac mini, macOS 12.7

Posted on Dec 6, 2025 7:34 AM

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Answer 1

baldbeardie Author

Level 1

23 points

Dec 7, 2025 12:42 PM in response to leroydouglas

Thanks, but as I said in the OP I have already done that.

There seems to me to be significance in there only being 1 of 3 clients affected by this, which seems to imply that the problem is not actually with the printer or its certificate, but with the one troublesome client Mac. It seems to imply either that there is something odd about that one Mac, or that the other two clients are not actually checking the certificate - and if I could work out how to achieve that on the 3rd client that might resolve the problem ...

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Answer 2

Dec 7, 2025 11:12 AM in response to baldbeardie

baldbeardie wrote:

I have Kyocera Ecosys P5026cdw attached to a Mac mini and shared on my LAN to 3 client Macs. The printer's certiificate recently expired, and one of the client Macs then stopped printing to that printer, giving an error explaining that the certificate expiry.

See if this is applicable—

update the expired printer certificate using these steps:

—>Systems Settings>Printers & Scanners

Printer name & select Printer Info>Options and Supplies

Show Printer Web Page;

if necessary make a security exception to continue Under Security> Certificates>Configure

Choose Create a New Self-Signed Certificate

(Edit the validity period if necessary) and click Finish

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