Question

Laserfiche and Quickfields version 10.4 Type="COMException" Message="The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)"

Quick Fields

Updated April 20

asked on April 17 • Show version history

We are currently running the Laserfiche Quick Fields Agent with scheduled sessions during both daytime and nighttime windows. The day session completes successfully without any issues; however, the night session is consistently interrupted and terminated.

During the nighttime run, the session fails due to an RPC service unavailability, which results in the Quick Fields session being forcibly terminated with the following error:

Error Type: InvalidCastException  
Message: Unable to cast COM object of type 'System.__ComObject' to interface type 
'BPINTERFACES81Lib.IBPEngineEx'. This operation failed because the QueryInterface 
call on the COM component failed due to the following error: 
The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)
Timestamp: 04/16/2026 11:13:55

We would appreciate any guidance or recommended solutions to address this issue and prevent interruptions to the nighttime Quick Fields session.

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Replies

replied on April 19 • Show version history

Hi,

This question appears to be similar to these posts: Quick Field Agent Error - Unable to Cast COM Object - Laserfiche Answers and Quick Fields Agent Session Errors - RPC server is unavailable - BPINTERFACES81Lib.IBPEngineEx - Laserfiche Answers

So could you please check that whether the detailed error trace in these posts is the same as yours?

Then here is potential solution: Install Quick Fields 12 Laserfiche 12 Release Information, we have included the fix for these posts.

If this solution couldn't solve your problem, Do you mind open a new support case for your issue and attach a full log in ticket?

Thanks!

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replied on April 20

If a support case is needed after the previous post, please refer to https://support.laserfiche.com/kb/1013993/quick-fields-technical-support-checklist and include the QF session and the outlined logs in the article.

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Laserfiche and Quickfields version 10.4 Type="COMException" Message="The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)"

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