We have a issue on our platform and we want to modify the default 404 error page. Could you tell us where it could be done ? We try on web.xml in ROOT directory and in conf directory but it doesn't work.
Component : UIM - UMP
this is controlled by Liferay for the UMP. Making changes of such as this are not supported by the UIM team.
The 404 pages is controlled by the underlying Liferay portal and is not a function of the UIM application. As such making changes to it is not supported nor documented.
I did check the Liferay forums and found the following that others have used to make changed to this.
Some external resources point to the 'layout.friendly.url.page.not.found' in portal-ext.properties file, which you can find it in below location: