IE11 not working with generated war (Vaadin 10)

Flow
1

Hi!
We are testing vaadin 10 LTS (10.0.10) with IE11 and Firefox.
I downloaded Bakery-App for Vaadin 10 LTS and generated the war-file for production with:
mvn package -Dvaadin.productionMode
in Eclipse.

Startup is with:
java -Dvaadin.productionMode -jar target/my-starter-project-1.0-SNAPSHOT.war
outside of Eclipse.
I can start the app with Chrome and a new Firefox.
But an older firefox(45) and IE11 show an empty logon-screen.
https://bakery-flow.demo.vaadin.com/login works with this IE11, so it should work!?

What am I missing?
In the IE11-Debugger I see that frontend-es5 is used, but the .js gives an error.
Thanks for any hints - Charly

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2

Hi all!

I downloaded Bakery12 (for Vaadin 12) and generated the war-file the same way I did with the Vaadin10-Version.
Same Startup.

Application runs with IE11 and old Firefox!

So what has to be done to run the Vaadin10-Version of Bakery with IE11?

Anyone knows?