A customer of us has a problem with the signatures. He gets the invoices electronically and wants to check the signatures but it does not go suspecting a network problem. Any ports must be enabled for the Acrobat Reader DC.
Customer request: "We are looking forward to the future of the company," he said.
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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.
Running on Windows