[horde] Random user not authorized messages from Registry.php

[Luis Felipe Marzagao]

Hello:

Horde 5.1.1.

I´m getting random 'user not authorized' msgs in my logs, like these:

Jul 10 14:34:16 mserver HORDE: User is not authorized for horde [pid 
1612 on line 267 of "/usr/share/php/Horde/Registry.php"]
Jul 10 14:34:18 mserver HORDE: User is not authorized for horde [pid 
1311 on line 267 of "/usr/share/php/Horde/Registry.php"]
Jul 10 15:42:01 mserver HORDE: User is not authorized for horde [pid 
2263 on line 270 of "/usr/share/php/Horde/Registry.php"]
Jul 10 16:42:04 mserver HORDE: User is not authorized for horde [pid 
2268 on line 270 of "/usr/share/php/Horde/Registry.php"]

Apparently, they are harmless, since everybody is using horde and all 
the modules just fine. But I´d like to further investigate this.

I´ve inserted Horde::debug($GLOBALS['registry']->getAuth()); in 
/usr/share/php/Horde/Registry.php to see what users were causing the 
problem, but it returned a false boolean, like this:

2013-07-10T18:42:01+00:00 DEBUG: Variable information:
bool(false)

Backtrace:
1. Horde_Registry::appInit() /var/www/horde/rampage.php:54
2. Horde::debug() /usr/share/php/Horde/Registry.php:268


How can I further debug this? Any directions?

Thanks.
Luis Felipe