> 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-3.md).

# Error while connecting to specified server: Method '' of object

[Command Centre - Connection Issues](/knowledge-hub/products/cc-software/troubleshoot/command-centre-connection-issues.md) › Method '~~' of object '~~' failed

**Error:** "Method '~~' of object '~~' failed" from the OPC Bridge Configuration tool.

**Cause:** the OPC username and password registry keys are missing.

## Resolution

1. Open **Registry Editor** (you may need Administrator privileges).
2. Locate:
   * **(32-bit OS):** `HKEY_LOCAL_MACHINE\SOFTWARE\Gallagher\Command Centre`
   * **(64-bit OS):** `HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Gallagher\Command Centre`
3. Right-click in the empty space and select **String Value (REG\_SZ)**. Create two keys named:
   * `OPCUserName`
   * `OPCPassword`
4. Enter an OPC username and password in the **Value Data**.

> ⚠️ **Security:** Create a separate OPC operator account with only the required privileges. The username and password stored in these registry keys are **not encrypted**.

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

![Method of object failed, registry keys](https://328339335-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6bM8WhlBE9BYizPWJaPN%2Fuploads%2Fgit-blob-afb46050a982a8fd61b1e44810d81d224b0a768d%2FSECHUB-CCS-CONN-METHOD-02.png?alt=media)

![OPC registry string values](https://328339335-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6bM8WhlBE9BYizPWJaPN%2Fuploads%2Fgit-blob-435553e8c25de638bbb8ee15ba93faf129b9fc23%2FSECHUB-CCS-CONN-METHOD-05.png?alt=media)

***

🔗 **Related**

* [OPC Connections 7.90 and higher - DCOM changes](/knowledge-hub/products/cc-software/troubleshoot/command-centre-connection-issues/command-centre-connection-issues-opc-c.md). The DCOM transport change that affects OPC.


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