I'm trying to timestamp (RFC 3161) a pdf using my own timestamp server hardware but always get an error: "Certificate invalid for use" (Original text - pt_BR:O certificado não é válido para uso). How can I get more info on what I'm missing or whats wrong with the certificate?
Which Acrobat version are you using? Do you use "Document Timestamp" command? If so, do you get this error during the signing process and the signature is not created or signature is created and you get this error when it is validated? If the latter you can open signature properties, click on the "Advanced Properties" and in the next dialog on timestamp's "Show Certificate". If you get this error during the signing process do you get an alert that shows some cryptic info with a number? If you do provide the content of this alert.
Also which Acrobat version (including minor) are you using?
I found the response to my problem: it was related to the certificate in the TSA and its "Extended Key Usage" attribute.
Anyway, thank you for your help. Just to answer to questions:
Version: Adobe Reader XI
A) timestamp of signature: signature appplied without timestamp and an alert
B) timestamp of document: no changes and an alert