Asterisk hangs at startup on chan_iax2.so

Hi,
my asterisk server hangs at startup loading chan_iax2.so, if I disable this module it starts up regularly.
I suspect permissions problems, I run Asterisk as ‘asterisk’ user (as described on voip-info.org/wiki/index.php … k+non-root) but I’m not sure.
Using ‘strace asterisk -U asterisk’, I was not able to see anything of interesting.

Thanks for any help