IPv6 and IPv4!

I’m using Amanda in SLES 11.
I followed a test configuration found on the web. All work well if I have IPv6 enabled, but with IPv4 disabled amdump does not work and it return:
ERROR planner Request to sles11.rex.it failed: error sending REQ: send REQ to sles11.rex.it failed: Socket operation on non-socket
on log file.

This seem to be a known problem, on some documents I read:
Either, fix your system to not return IPv6 address to amanda
or enable IPv6 in the kernel

but how to fix my system to not return IPv6?
On my test environment I use /etc/hosts for name resolving, and I don’t have any IPv6 address configured for the name I use.

Thanks for any help