Rick Low wrote:

> However, the resolv.conf files in /etc and /var/etc are still empty
> (just one "domain" line).
> 
> But when I manually added the two name servers from
> /var/etc/nameservers.conf into /etc/resolv.conf, everything started
> working.

For reference - Rick and I have been able to resolve this issue 
completely. As it turned out, in addition to the missing lines in 
mpd.conf that Rick pointed out, there was an issue with the CGI version 
of PHP that took me a while to track down (it ignores the script file 
name passed to it via the command line if the environment variable 
SCRIPT_FILENAME is also set, which is possible because sub-processes 
normally inherit their parents environment). The fix (DNS servers 
assigned via PPPoE or PPTP are finally used for the DNS forwarder) will 
be in the next release.

- Manuel