There used to be problems with certification with this device, but this has been fixed since Profinet Version 3.3.1.0. Otherwise, this error typically occurs when something is wrong with the request/response sequence of the RPC layer. - for example because a firewall is swallowing part of the communication. - or it is the RPC packets themselves that are faulty. In both cases, however, to find the reason for the error, a Wireshark capture of the connection setup is needed. Otherwise, there can not be said anything with certainty.
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