This is a classic DCOM permission issue. Ensure that the Windows user account running the FactorySoft client matches the account credentials running the OPC Server, or that both accounts exist on both machines with identical passwords. Error: "RPC Server Unavailable (0x800706BA)"
Check if the column says "Good" and values are updating. 🔍 Troubleshooting Common Issues "Class not registered" DLLs failed to register Run the installer or Command Prompt as Admin. Server list is empty OPC Enumerator missing Install OPC Core Components from the OPC Foundation. Access Denied (0x80070005) DCOM Permissions Add the user to the "Distributed COM Users" group. RPC Server Unavailable Firewall blocking Open Port 135 and create an exception for the client. If you'd like to refine this setup further, tell me:
: Check that the user account running the FactorySoft client has permissions in the DCOM configuration of the OPC Server. factorysoft opc client install
Select or create a program folder shortcut name, then click Next .
Right-click FactorySoft_OPC_Client_v5.2.8.msi or Setup.exe → . Why? The installer must register COM components in the registry hive HKCR\CLSID . This is a classic DCOM permission issue
Under the tab, edit both Limits and Defaults for Access Permissions and Launch/Activation Permissions.
If it is an .exe file, right-click it and select > Unblock (if visible) to prevent Windows from flagging it. ⚙️ Step 2: Running the Installation Wizard Locate the setup.exe or FactorySoft_Client.msi file. Right-click and select Run as Administrator . Follow the on-screen prompts: License Agreement: Read and accept the terms. RPC Server Unavailable Firewall blocking Open Port 135
If you see the quality status display as and the values dynamically updating in real-time, your FactorySoft OPC Client installation is successful and ready for production use.
You must open specific ports on both machines to allow communication: Required for the DCOM RPC Endpoint Mapper.
Locate the server navigation panel (typically a tree view on the left).