No idea, try asking on the mailing list

Thanks Jan.... We use thunderbird/Lightning... Does it support this 
"preemptive" authentication ? I did not find where it is in the 
options....

Best regards.

Gérard Breiner

This is from clients that try to synchronize without authentication 
first. Some clients allow to activate "preemptive" authentication.

Since I did the migration horde 5.1.1 to 5.1.5 and kronolith 4.1.0 to 4.1.4
My horde.log is polluted with error messages :
EMERG: HORDE [horde] User is not authorized  [pid 7706 on line 1547 of
« /www/horde5/pear/php/Horde/Registry.php « ]

It appears that this issue are linked with subscriptions at kronolith
agendas from thunderbird/Lightning or Calendar (MacOS).

In order to trace this issue, I added two lines in Registry.php ($file
and $tt) as below.

[code]
if ($checkPerms) {
         if ($this->getAuth() && !$this->checkExistingAuth()) {
             $file = '/www/horde5/pear/php/Horde/debug-backtrace.txt';
             $tt = Horde::debug($GLOBALS['registry']->getAuth(), $file);
             throw new Horde_Exception_PushApp(
                                     'User is not authorized'.$tt, 
self::AUTH_FAILURE, $app);
         }
[/code]

"tail -300 debug-backtrace.txt" give  the output below.

2014-01-14T14:37:40+01:00 DEBUG: Variable information:
string(8) "jmartin"

Backtrace:
1. Horde_Rpc_Webdav->getResponse() /www/horde5/rpc.php:156
2. Sabre\DAV\Server->exec() /www/horde5/pear/php/Horde/Rpc/Webdav.php:67
3. Sabre\DAV\Server->invokeMethod()
/www/horde5/pear/php/Sabre/DAV/Server.php:214
4. Sabre\DAV\Server->broadcastEvent()
/www/horde5/pear/php/Sabre/DAV/Server.php:455
5. call_user_func_array() /www/horde5/pear/php/Sabre/DAV/Server.php:433
6. Sabre\DAVACL\Plugin->beforeMethod()
7. Sabre\DAV\ObjectTree->nodeExists()
/www/horde5/pear/php/Sabre/DAVACL/Plugin.php:701
8. Sabre\DAV\ObjectTree->getNodeForPath()
/www/horde5/pear/php/Sabre/DAV/ObjectTree.php:96
9. Sabre\DAV\Collection->getChild()
/www/horde5/pear/php/Sabre/DAV/ObjectTree.php:64
10. Horde_Dav_RootCollection->getChildren()
/www/horde5/pear/php/Sabre/DAV/Collection.php:33
11. Horde_Registry->hasMethod()
/www/horde5/pear/php/Horde/Dav/RootCollection.php:85
12. Horde_Registry_Api->methods()
/www/horde5/pear/php/Horde/Registry.php:1077
13. Ingo_Api->disabled() /www/horde5/pear/php/Horde/Registry/Api.php:86
14. Horde_Registry->pushApp() /www/horde5/ingo/lib/Api.php:37
15. Horde::debug() /www/horde5/pear/php/Horde/Registry.php:1548

I eventually managed to reproduce this issue with my own account? It 
appears that theses error messages (User is not authorized) are logged 
when the users configure his client Thunderbird/Lightning or Calendar 
(apple) for an automatic synchronization. With a manual 
synchronization, all works very fine?
I have never encountered this issue with horde 5.1.1 kronolith 4.1.0. 
Now it is horde 5.1.5 and kronolith 4.1.4.

A request that is not recognized by horde ?

Thanks in advance.

Best regards.

Gérard Breiner