You might try a different tunneler, such as this one: https://www.unified-automation.com/products/wrapper-and-proxy/uagateway.html
I have very little OPC Classic experience so I’m not sure I can be much more help.
You might try a different tunneler, such as this one: https://www.unified-automation.com/products/wrapper-and-proxy/uagateway.html
I have very little OPC Classic experience so I’m not sure I can be much more help.