Webdav connects ok and shows list of siteaccesses, but when trying to cd to one fails to authenticate although i try to log in as admin. There are no errors in ezp or php log, just this in warning log that may be relevant:

PHP: E_WARNING: strpos() [<a href='function.strpos'>function.strpos</a>]: Empty delimiter. in /var/www/ez/411_site/lib/ezc/Webdav/src/path_factories/automatic.php on line 113

Same warning on line 118.

Site is ezp 4.1.1 on Ubuntu 8.4 LTS, php5 running under apache2 as fastcgi.

From phpinfo:
_SERVER["FCGI_ROLE"] RESPONDER
_SERVER["HTTP_HOST"] php5test.s1.nvsstedet.com
_SERVER["HTTP_USER_AGENT"] Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.10) Gecko/2009042513 Ubuntu/8.04 (hardy) Firefox/3.0.10
_SERVER["HTTP_ACCEPT"] text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
_SERVER["HTTP_ACCEPT_LANGUAGE"] en-us,en;q=0.5
_SERVER["HTTP_ACCEPT_ENCODING"] gzip,deflate
_SERVER["HTTP_ACCEPT_CHARSET"] ISO-8859-1,utf-8;q=0.7,*;q=0.7
_SERVER["HTTP_KEEP_ALIVE"] 300
_SERVER["HTTP_CONNECTION"] keep-alive
_SERVER["PATH"] /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin
_SERVER["SERVER_SIGNATURE"] <address>Apache/2.2.8 (Ubuntu) PHP/4.4.9 Server at php5test.s1.nvsstedet.com Port 80</address>
_SERVER["SERVER_SOFTWARE"] Apache/2.2.8 (Ubuntu) PHP/4.4.9
_SERVER["SERVER_NAME"] php5test.s1.nvsstedet.com
_SERVER["SERVER_ADDR"] 172.16.172.70
_SERVER["SERVER_PORT"] 80
_SERVER["REMOTE_ADDR"] 80.235.57.224
_SERVER["DOCUMENT_ROOT"] /var/www/php5test
_SERVER["SERVER_ADMIN"] [no address given]
_SERVER["SCRIPT_FILENAME"] /var/www/php5test/inff.php
_SERVER["REMOTE_PORT"] 52257
_SERVER["GATEWAY_INTERFACE"] CGI/1.1
_SERVER["SERVER_PROTOCOL"] HTTP/1.1
_SERVER["REQUEST_METHOD"] GET
_SERVER["QUERY_STRING"] no value
_SERVER["REQUEST_URI"] /inff.php
_SERVER["SCRIPT_NAME"] /inff.php
_SERVER["PHP_SELF"] /inff.php
_SERVER["REQUEST_TIME"] 1242222743
_SERVER["argv"]

Array
(
)

_SERVER["argc"] 0
_ENV["FCGI_ROLE"] RESPONDER
_ENV["HTTP_HOST"] php5test.s1.nvsstedet.com
_ENV["HTTP_USER_AGENT"] Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.10) Gecko/2009042513 Ubuntu/8.04 (hardy) Firefox/3.0.10
_ENV["HTTP_ACCEPT"] text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
_ENV["HTTP_ACCEPT_LANGUAGE"] en-us,en;q=0.5
_ENV["HTTP_ACCEPT_ENCODING"] gzip,deflate
_ENV["HTTP_ACCEPT_CHARSET"] ISO-8859-1,utf-8;q=0.7,*;q=0.7
_ENV["HTTP_KEEP_ALIVE"] 300
_ENV["HTTP_CONNECTION"] keep-alive
_ENV["PATH"] /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin
_ENV["SERVER_SIGNATURE"] <address>Apache/2.2.8 (Ubuntu) PHP/4.4.9 Server at php5test.s1.nvsstedet.com Port 80</address>
_ENV["SERVER_SOFTWARE"] Apache/2.2.8 (Ubuntu) PHP/4.4.9
_ENV["SERVER_NAME"] php5test.s1.nvsstedet.com
_ENV["SERVER_ADDR"] 172.16.172.70
_ENV["SERVER_PORT"] 80
_ENV["REMOTE_ADDR"] 80.235.57.224
_ENV["DOCUMENT_ROOT"] /var/www/php5test
_ENV["SERVER_ADMIN"] [no address given]
_ENV["SCRIPT_FILENAME"] /var/www/php5test/inff.php
_ENV["REMOTE_PORT"] 52257
_ENV["GATEWAY_INTERFACE"] CGI/1.1
_ENV["SERVER_PROTOCOL"] HTTP/1.1
_ENV["REQUEST_METHOD"] GET
_ENV["QUERY_STRING"] no value
_ENV["REQUEST_URI"] /inff.php
_ENV["SCRIPT_NAME"] /inff.php

What could be wrong?