topic Re: Spark clusters failing to start - private link check failed in Data Engineering

Spark clusters failing to start - private link check failed

kayl-669 — Tue, 09 Sep 2025 08:13:14 GMT

We've not made any private link related changes with our Fabric workspaces and yet we're not able to start spark sessions for the last 8 or so hours due to an error as follows (when attempted in an interactive session):

Scheduled notebooks fail to execute a magic command with error like:

Just wondering if anyone else is experiencing this?

Re: Spark clusters failing to start - private link check failed

kmvaishakha — Tue, 09 Sep 2025 08:15:54 GMT

Facing same issue . Not able to start session in Notebook

Re: Spark clusters failing to start - private link check failed

kayl-669 — Tue, 09 Sep 2025 08:38:09 GMT

I've raised a support ticket now. Our Fabric capacities are in UK South FYI

Re: Spark clusters failing to start - private link check failed

MSladeIT — Tue, 09 Sep 2025 09:06:53 GMT

Same Issue here, currently on a trial but in the process of setting up our own capacity....this doesn't bode well for the decision to go forward if this is a common issue.

Re: Spark clusters failing to start - private link check failed

maratbatkaevlam — Tue, 09 Sep 2025 09:15:57 GMT

Same problem, UK South. Looks like scheduled notebooks run fine but when you try to start a session from the browser it doesn't work

Re: Spark clusters failing to start - private link check failed

nsam101 — Tue, 09 Sep 2025 09:26:26 GMT

Same issue here. UK South too. Never get past "Starting session" status when trying to start a Spark session in Notebook.

Re: Spark clusters failing to start - private link check failed

knuckey — Tue, 09 Sep 2025 09:31:09 GMT

Yes, we are on UK South and experiencing same issue.

Re: Spark clusters failing to start - private link check failed

GDsmbplz — Tue, 09 Sep 2025 09:50:36 GMT

Same issue, UK South. Have raised a support ticket and will update with any fixes/suggestions I'm given. Good luck all!

Re: Spark clusters failing to start - private link check failed

mwol — Tue, 09 Sep 2025 09:52:28 GMT

I'm having the same issue in UK-South as well, doesn't seem like Microsoft acknowledged it yet.

Re: Spark clusters failing to start - private link check failed

GCashSimpsons — Tue, 09 Sep 2025 09:52:43 GMT

I get the same issue, yet "All services are running smoothly" on the Service Status

Re: Spark clusters failing to start - private link check failed

DShallcross — Tue, 09 Sep 2025 10:17:21 GMT

Same issue with me. UK-South too

Re: Spark clusters failing to start - private link check failed

CrazyCraigo — Tue, 09 Sep 2025 10:19:59 GMT

Same issue - UK South

Re: Spark clusters failing to start - private link check failed

DShallcross — Tue, 09 Sep 2025 12:38:01 GMT

This situation should be resolved now. Someone from Microsoft called me up to say they had an outage but it's back now.

Re: Spark clusters failing to start - private link check failed

kayl-669 — Tue, 09 Sep 2025 13:20:36 GMT

Seems to be an intermittent issue now rather than a constant one

Re: Spark clusters failing to start - private link check failed

knuckey — Tue, 09 Sep 2025 13:38:02 GMT

Thanks for the update, we are back up and running now.

Re: Spark clusters failing to start - private link check failed

v-karpurapud — Thu, 11 Sep 2025 09:54:35 GMT

Hi @kayl-669

Could you please confirm if the issue has been resolved after raising a support case? If a solution has been found, it would be greatly appreciated if you could share your insights with the community. This would be helpful for other members who may encounter similar issues.

Thank You .

Re: Spark clusters failing to start - private link check failed

kayl-669 — Thu, 11 Sep 2025 10:02:55 GMT

Hi @v-karpurapud ,

The issues we all experience were due to a Fabric platform outage as detailed in the MS Service Status page:

My hope in raising a support case was that it would result in MS identifying an issue in their platform quicker. My support experience was that our issue was misidentified as a different N. Europe outage that was showing as already resolved on the service status page - so wasn't helpful.

🙂

Re: Spark clusters failing to start - private link check failed

v-karpurapud — Mon, 15 Sep 2025 05:14:28 GMT

Hi @kayl-669

Thank you for the update. Since many users are experiencing this issue, Microsoft is investigating and working to resolve it. We appreciate your patience as Microsoft addresses the problem.

Regards,
Microsoft Fabric Community Suport Team.