> For the complete documentation index, see [llms.txt](https://help.security.gallagher.com/knowledge-hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.security.gallagher.com/knowledge-hub/products/cc-software/troubleshoot/command-centre-connection-issues/command-centre-connection-issues-e-2.md).

# Error while connecting to specified server: Interface not regis

[Command Centre - Connection Issues](/knowledge-hub/products/cc-software/troubleshoot/command-centre-connection-issues.md) › Interface not registered

**Error:** "Interface not registered" from the OPC Bridge Configuration tool.

**Cause:** three proxy/stub DLLs in the Command Centre Bin folder need to be registered manually.

## Resolution

1. Open a Command Prompt and **run as administrator**.
2. Locate the Bin folder (default `C:\Program Files (x86)\Gallagher\Command Centre\Bin`):

   ```
   cd C:\Program Files (x86)\Gallagher\Command Centre\Bin
   ```
3. Register the three DLLs:

   ```
   regsvr32 opc_aeps.dll opccomn_ps.dll opcSec_PS.dll
   ```
4. You will receive three messages confirming each DLL registered successfully.

Then try to connect to the OPC Server in the OPC Bridge Configuration tool again.

![Interface not registered error](https://328339335-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6bM8WhlBE9BYizPWJaPN%2Fuploads%2Fgit-blob-05b834326ffe3c4ad249c906735caadfdeaf65ef%2FSECHUB-CCS-CONN-INTERFACE-01.png?alt=media)

![DLL registration successful](https://328339335-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6bM8WhlBE9BYizPWJaPN%2Fuploads%2Fgit-blob-43ce116b9a9f154ae11adf02fd7aedfc769e01d8%2FSECHUB-CCS-CONN-INTERFACE-03.png?alt=media)

***

🔗 **Related**

* [error while connecting to specified server: Method '~~' of object '~~' failed](/knowledge-hub/products/cc-software/troubleshoot/command-centre-connection-issues/command-centre-connection-issues-e-3.md). The next OPC Bridge error.


---

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