Canon C2550 - Manual (Page 172)

Encrypted SSL Data Communication Problems and Remedies 7-18
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<Digital sig. cert. access err.> is displayed.
Cause 1 Access to the user certificate was denied when sending a PDF with a user
signature.
Remedy See "Generating and Confirming a Key Pair and Device Signature Certificate
and User Certificate for Adding Digital Signatures to PDF Files" on p. 3-35 to
confirm the user certificate settings.
Cause 2 Access to the device certificate was denied when sending a PDF with a device
signature.
Remedy See "Generating and Confirming a Key Pair and Device Signature Certificate
and User Certificate for Adding Digital Signatures to PDF Files," on p. 3-35 to
confirm the device certificate settings.