[horde] Horde sabre caldav authentication

[Will Holland]

Hi,

I have been using horde for many years for webmail, but with the 
addition of active sync and other great features I am working on trying 
to phase out outlook and use the thunderbird with lightning to sync 
calendars and contacts with horde. I have successfully configured 
activesync and am able to logon to horde directly.

The problem arises when I try to use the subscription links, provided by 
horde, for the calendars or contacts. I get a dialog box to enter the 
user/pass. Each time I enter the user/pass it fails to authenticate and 
on the third fail I get:

<?xml version="1.0" encoding="utf-8" ?>
- <#> <d:errorxmlns:d="*DAV:*"xmlns:s="*http://sabredav.org/ns*">
<s:exception>Sabre\DAV\Exception\NotAuthenticated</s:exception>
<s:message>No basic authentication headers were found!</s:message>
<s:sabredav-version>1.8.7</s:sabredav-version>
</d:error>

I have tried changing authentication horde to IMAP, which has no effect. 
I can still login in to horde but the calendar and contact subscription 
links wont authenticate.


I have tracked the exception to this file

*/usr/share/psa-pear/pear/php/Sabre/DAV/Auth/Backend/AbstractBasic.php

*which I believe calls this file to get the username/pass

/usr/share/psa-pear/pear/php/Sabre/HTTP/BasicAuth.php


I have submitted this issue to parallels for support, but they say they 
don't support it since it a third party product, even though it is very 
integrated into plesk.

I am running:
horde 5.15
plesk 11.5.30
centos 6.5
PHP 5.3.3

Any help is appreciated.

Thanks,
Will