OPC DA Client not working in Windows 10 x64|Classic OPC: DA, A&E, HDA, XML-DA, etc.|Forum|OPC Foundation

Hi Bobby,

is this issue still pending? To get an OPC DA client / server communication properly working via network is always a challenge! Basically I can say, that it works with a Windows 10 64 bit machine on the client side. Meanwhile I have found a slightly unusual approach to analyze and solve the DCOM and firewall configuration issues causing such issues:

On the OPC client side I use Wireshark to capture the Ethernet traffic between the client and the server. The telegram sequences between client and server provides a detailed insight into the communication flow and at which stage the communication fails.

So, if you still need assistance in this matter, just capture the network traffic with Wireshark and send me the capture file for analysis. In Wireshark you should set the following capture filter: 'host <IP address of OPC server>' Unfortunately it is not useful to filter/capture only the COM/DCOM communication on port 135 because the actual (bidirectional) client/server connections use port numbers in range between 49152 to 65535. 

Regards,

Jürgen