“Upgrade Automatically Plugins” ftp_rawlist error message

Hi there,

I would like to use the “upgrade automatically” feature for the plugins. But I get this message when launching the update procedure:

Warning: ftp_rawlist() [function.ftp-rawlist]: Unable to create temporary file. Check permissions in temporary files directory. in /is/htdocs/wp1010529_VVSEGYPQJL/www/my_blog/wp-admin/includes/class-wp-filesystem-ftpext.php on line 327
Warning: ftp_rawlist() [function.ftp-rawlist]: Unable to create temporary file. Check permissions in temporary files directory. in /is/htdocs/wp1010529_VVSEGYPQJL/www/my_blog/wp-admin/includes/class-wp-filesystem-ftpext.php on line 327

Now, when echoing the file it has problems with it spits out this:
/is/htdocs/wp1010529_VVSEGYPQJL/www/my_blog/wp-settings.php

Does it want to write the wp-settings-file? Which dirs or files must be set to 777 or so in order that the thing works?

Thanks for any help!