"Invalid password input. Try again." when trying to add CA certificate to LaserJet M428dw

[edirap]

When I try to add a CA certificate to my LaserJet Pro MFP M428dw I get the following error:

> Invalid password input. Try again.

The error doesn't make much sense as I'm trying to import a (public) CA certificate from a file, there is no password involved. Some extra info:

• The certificate comes from [content removed] and it's of course not password protected
  • I checked the .pem file contents and it's a normal base64 encoded certificate
  • I also tried with other CAs with no luck
• I tried both PEM and DER formats
• I tried with multiple browsers (Firefox, Chrome)
• The printer is running the latest available firmware (TETONXXXXN002.2339A.00)
• It used to work in the past (a few firmware versions ago)
• I need this to enable the scan to email function
  • No I don't want to disable the certificate validation

Here is a screenshot of the error:

Any hint? Thanks!

[edirap · Accepted solution]

I figured it out: that error is triggered when uploading a ECC certificates. Uploading RSA certificates works fine.