As from the issue description mentioned above, a user is unable to check the signatures due to a network issue, is that correct?
Could you let us know the application you are using to sign the document - Adobe Reader/ Adobe Acrobat?
Is there any error message you are receiving?
Which operating system is installed on the machine-Mac/Windows?
Awaiting your response.
Since the signature is valid but the block list it can not check on the identity.
Request from the customer: we get the invoices as signed PDFs from many suppliers. The signature is checked when the file is opened. Here seems to be a communication problem and only after a timeout has expired, the document is open. The message "..., but the lock of the identity of the signer could not be checked." (see the screenshot).
We then told him he should issue it and it worked so well.
Now he said he wants the signature to be checked.
Can it be that the ports must be released?
Program version: Adobe DC version 2017.009.20044.