One can reproduce that bug by having IPv6 only on eth0 and no other interface with IPv4 but localhost, and /etc/hosts matching `hostname` on any lo address.
Call (forward) trace: ap_get_local_host apr_sockaddr_info_get find_addresses call_resolver getaddrinfo ... that fails since it is using AI_ADDRCONFIG flag on loopback interface This bug is actually the same as 500558.
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