When my site is : http://localhost:8105, I have no issues.

When I try to add a context to my site http://localhost:8105/test
The authenticate url becomes : http://localhost:8105/test/_authenticate?requestedURL=/test/fr/index.html
=> An error occurred : ResourceNotFoundException ...

And when I remove test of the URL : http://localhost:8105/_authenticate?requestedURL=/test/fr/index.html, I have the good behaviour.

It suppose to be the opposite ....

To continue, I change the tomcat context of my site => ROOT to test
And automaticaly, the issue was fixed.