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Question:
How can the signature/certificate for Connect to SAP be deactivated?

Solution:
You need to deactivate the signature on DocuWare and SAP side.

On DocuWare side use DocuWare Administration, go to Server > Connections.
Disable the flag 'Enable secure communication'  and restart the SAP HTTP Service.

On SAP open the transaction 'OAC0'. Enable the flag 'No signature'.