Hi,
I came across this same issue, and thought I would share my solution.
This is caused by the guest user not having permissions to view any page in the home site. This means when a user hits the home/login page, they don't have access, which causes Liferay to redirect them to log in (i.e. back to the home page), which starts a redirect cycle until the URL is too long and you get a HTTP 414 Error.
For me, the Guest permissions were cleared by me hitting "Save" after viewing the permissions of the Home page of the Home site. Note: I did not change the View value for Guest (in fact it is disabled), but still, the permission value was cleared (which I found out by digging in the database).
I fixed this in the database by:
- Determining the ID of the Guest role:
select * from Role_ where name = 'Guest'
- Determining the ID of the home page (this might not be the best way):
select * from Layout where privateLayout = 0 and userName = '';
- Updating the resource permission corresponding to the Home page and guest role:
update resourcepermission
set actionIds = 1
where roleId = <role_id>
and name = 'com.liferay.portal.model.Layout'
and primKey = <layout_id>;
- Retarting Liferay
After a restart, I could navigate back to the home page successfully.
Hope this helps someone in the future!
