J3.x:Infinite error loop on multilanguage sites
From Joomla! Documentation
In some multilingual sites that were created before Joomla 2.5.4 when upgrading to 3.4 you can have a redirect loop created.
Errors reported
Infinite redirect in browser when attempting to visit multilingual site.
Versions affected
General Information
This pertains only to Joomla! version(s):- 3.4
What is the cause
In Joomla 2.5.4 and earlier the access level was not correctly stored in the database and as a result a value of 0 was obtained. This therefore then fails against the access check in the language filter plugin creating a redirect loop.
How to fix
Edit each content language in Language Manager and ensure a access level (generally public) is set for each installed language.