Attach Warning

bridgetoneill — Wed, 26 Aug 2026 10:23:35 GMT

Hi all,

We've had issues with Attach warnings since upgrading to Blue Prism 7.4.2.

An overview: sporadically, scheduled processes go into Warning status in Control Room when trying to attach to a Chrome instance. It primarily happens on the first attach after Chrome is launched. Once it goes into Warning it hangs there until we manually intervene.

I've seen this issue, or similar, mentioned a couple of times in these forums:
#https://community.blueprism.com/t5/Product-Forum/BP-V7-process-hangs-on-Attach-and-sticks-in-Warning-state/td-p/126059

#https://community.blueprism.com/t5/Product-Forum/Warning-when-attaching-to-browser-causes-process-to-hang/m-p/124111#M54255

What we've already tried:

Increased the Browser Extension messaging host timeout in System Settings to 40 seconds
Kill Chrome at the start of the process
A throttle after Chrome is launched

What I'm going to try next:

A throttle after the kill and before the launch

Given this has come up a few times before, has anyone got to a root cause or a fix?

Thanks,
Bridget

Re: Attach Warning

OmegaRPA — Wed, 26 Aug 2026 14:53:09 GMT

Hi Bridget, we've had this exact issue on 7.4.1 where it's only ever the first attach of a session! In our experience, there are a couple webapps that are affected more than others - those webapps being ones where some login/auth is taking place, and some redirects are happening in the browser.

Timeouts, messaging host timeout, and throttles and Edge kills made no difference to us.

We recently got a specfix from BP. I advise you reach out to John Pass of customer support and mention the specfix, as it has only recently been delivered (under 2 weeks ago).

But in that time since installing, we have had ZERO hangs on our machines, so I'd say it's done the job...

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Attach Warning

Re: Attach Warning