# OPC DA Connectivity Troubleshooting Between Ignition Edge and Kepware

**URL:** <https://forum.inductiveautomation.com/t/opc-da-connectivity-troubleshooting-between-ignition-edge-and-kepware/106711>\
**Category:** Ignition\
**Tags:** edge\
**Created:** [May 27, 2025, 9:48am UTC](https://forum.inductiveautomation.com/t/opc-da-connectivity-troubleshooting-between-ignition-edge-and-kepware/106711 "2025-05-27T09:48:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Ashlin\_Antony](https://avatars.discourse-cdn.com/v4/letter/a/df705f/32.png) [@Ashlin\_Antony](https://forum.inductiveautomation.com/u/Ashlin_Antony)\
**Post date:** [May 27, 2025, 9:48am UTC](https://forum.inductiveautomation.com/t/opc-da-connectivity-troubleshooting-between-ignition-edge-and-kepware/106711/1 "2025-05-27T09:48:19Z")

</div>

**Issue:**  
Trying to get values from a remote kepserver into ignition edge via OPC DA. Ignition Edge OPC DA connection to a remote Kepware server fails with `0x80040154 (Class not registered)` and `E_ACCESSDENIED` errors, despite successful tag reads using Matrikon OPC Explorer on the same Edge machine.

**Steps Taken:**

1. **DCOM and User Configuration:**

- Ensured matching local admin user accounts on both Kepware and Edge machines.
- Configured DCOM permissions for OpcEnum and Kepware DCOM objects (Launch/Activation and Access for Everyone/ANONYMOUS LOGON).
- Set Ignition Edge service to run under a DCOM-authorized admin account.

1. **OPC Core Components:**

- Installed both 32-bit and 64-bit OPC Core Components Redistributables on the Edge machine.
- Registered required 32-bit OPC DLLs using `regsvr32` from SysWOW64.

1. **Registry Edits:**

- Located the CLSID for `Kepware.KEPServerEX.V6` on the Kepware server.
- Created and merged `.reg` files on the Edge machine under both regular and WOW6432Node registry paths, including correct RemoteServerName (Kepware server’s computer name).

1. **Firewall:**

- Opened TCP port 135 and dynamic ports 49152–65535 on both machines.
- Allowed OPCEnum.exe through the firewall.

1. **Testing and Validation:**

- Used Matrikon OPC Explorer on the Edge machine to confirm OPC tags are readable from Kepware.
- Ignition Edge still fails with class registration errors and cannot browse/connect to the remote server.

**Current Status:**

- OPC access from third-party clients (Matrikon) works on the Edge machine.
- Ignition Edge OPC COM module still cannot connect to the remote Kepware server due to class registration errors, despite all registry, DCOM, and firewall steps above.

**Request:**  
Looking for any additional steps or insights to resolve the `Class not registered` error for OPC DA connections in Ignition Edge, or confirmation if there are known limitations with 32-bit Kepware and 64-bit Ignition Edge DA connectivity.