topic Re: Copy activity from Oracle to Lakehouse fails without staging in Data Engineering

Copy activity from Oracle to Lakehouse fails without staging

vietng — Sat, 24 Jan 2026 03:07:51 GMT

Hello everyone,

I have Oracle on-prem → Gateway → Fabric Lakehouse setup. I try to create a simple Copy Activity in Data pipeline to read 1 table (just 3 records) from Oracle and write to Lakehouse table.

This pipeline always fails with this error: "ErrorCode=LakehouseOperationFailed An existing connection was forcibly closed by the remote host". Then I turn the "Enable staging" on with the option Data store type is Workspace; the pipeline works perfectly fine.

Question: Why does direct copy fail (even with only 3 records), but staging works?

P/s: Gateway already opened these endpoints/ports:

Re: Copy activity from Oracle to Lakehouse fails without staging

deborshi_nag — Sat, 24 Jan 2026 11:56:53 GMT

Hello @vietng

A Staged Copy is necessary when port 1433 isn't open for SQL connections. Since ticking "Enable Staging" resolves the issue, it suggests that port 1433 is needed for your data copy. Usually, copying data to a Fabric Lakehouse or OneLake doesn't require outbound port 1433. Are you working with a SQL Warehouse or using a SQL Endpoint instead of a Lakehouse ? That might be why you're experiencing this issue.

You might want to whitelist this and see if that works.

*.datawarehouse.pbidedicated.windows.net | 1433

Re: Copy activity from Oracle to Lakehouse fails without staging

vietng — Sat, 24 Jan 2026 12:18:02 GMT

Hi @deborshi_nag
Thank you for your support. About your question, I use the Lakehouse connection in the Destination settings (select Browse all, then choose my Lakehouse in the list), so it can't be the SQL Warehouse or SQL Endpoint right?

Re: Copy activity from Oracle to Lakehouse fails without staging

deborshi_nag — Sat, 24 Jan 2026 12:32:04 GMT

Hi @vietng Even if you're choosing a Lakehouse it may still be using the SQL Endpoint behind the scenes, since I'm guessing you're writing in the /Tables area. Trying opening the 1433 port and see if it works.

Re: Copy activity from Oracle to Lakehouse fails without staging

tayloramy — Mon, 26 Jan 2026 14:35:31 GMT

Hi @vietng,

One small correction, if you're targeting a lakehouse, it wouldn't be using the SQL endpoint to write data as the sql endpoint is read only, but @deborshi_nag is correct that it might still be using the SQL ports to do the data movement.

I always recommend opening all the ports found on this page when doing gateway maintenance:
Adjust communication settings for the on-premises data gateway | Microsoft Learn

Re: Copy activity from Oracle to Lakehouse fails without staging

v-prasare — Wed, 28 Jan 2026 09:31:33 GMT

Hi @vietng,

We would like to confirm if our community members answer resolves your query or if you need further help. If you still have any questions or need more support, please feel free to let us know. We are happy to help you.

Thank you for your patience and look forward to hearing from you.
Best Regards,
Prashanth Are
MS Fabric community support

Re: Copy activity from Oracle to Lakehouse fails without staging

v-prasare — Mon, 02 Feb 2026 10:56:34 GMT

Hi @vietng,

Thank you for your patience and look forward to hearing from you.
Best Regards,
Prashanth Are
MS Fabric community support