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Adrian Reyes over 1 year ago

Hi,

We are struggling with Emerson DCS OPC DA Server to PI interface connection as it keeps disconnecting when we restart the opc server.

There is no issue before but when we installed a firewall in between these system for security segementation using NAT, we experience this problem.

Not sure if someone has an idea to resolve it.

Thank you.

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panagiotis.perdikis over 1 year ago +1

Hello Adrian, Apart from the NAT part, passing OPC DA traffic through a firewall is tricky because OPC DA uses a dynamic and very wide range of ports. so you have few options: A. open a very wide range…

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Brent bregenzer over 1 year ago

Adrian Reyes, have you checked this article: Will DCOM work with a NAT device?
Basically, it says that DCOM, the underlying technology for OPC DA, is designed to work with explicit IP addresses so it won't function correctly with NAT in between the server and client.
This is supported by other articles such as this one: Acquire Data From an OPC Server Through a Router OPCTI FAQ
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Brent bregenzer over 1 year ago

Adrian Reyes, have you checked this article: Will DCOM work with a NAT device?
Basically, it says that DCOM, the underlying technology for OPC DA, is designed to work with explicit IP addresses so it won't function correctly with NAT in between the server and client.
This is supported by other articles such as this one: Acquire Data From an OPC Server Through a Router OPCTI FAQ
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