Concurrent IE11 execution fails intermittently

[berrutti]

Are you requesting a feature or reporting a bug?

Reporting a bug

What is the current behavior?

We have a battery of 30+ tests. Sometimes IE explorer fails to open enough browsers while executing concurrently and tests execution hang. Only 3 or 4 windows open and nothing happens on console. The browsers display the "Connected" message but remain idle (E.G: http://172.16.106.8:1268/browser/idle/XouBY5T) I presume because those are waiting until enough browsers are open, but that never happens.
After some timeout, the following message is displayed on console:
ERROR Unable to establish one or more of the specified browser connections. This can be caused by network issues or remote device failure.
And the open IE windows close

What is the expected behavior?

The amount of browsers declared after the -c option should open. Tests execution should start without problems

How would you reproduce the current behavior (if this is a bug)?

Run a battery of 30+ tests concurrently on IE11 (Between -c 5 and -c 10 should be enough).
After trying multiple times, enough windows are opened and the tests start, but it's not clear what can be causing this issue.
It's not a memory/resources problem. After trying some more times, the tests start normally.

Provide the test code and the tested page URL (if applicable)

Tested page URL:

Test code

Specify your

• operating system: Windows 10 PRO 1803 - OS Compilation 17134.112
• IE version: 11.112.17134.0 - Update version: 11.0.70 (KB4230450)
• testcafe version: 0.20.3
• node.js version: v8.9.4

[miherlosev]

Hi @berrutti

This problem is related to IE11. It takes a lot of RAM and CPU.
There is an issue - Restart browser if it became unresponsive - that should help to fix it. Track this issue to be aware about progress.

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