System info
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freebsd
FreeBSD www337.sakura.ne.jp 11.2-RELEASE-p15 FreeBSD 11.2-RELEASE-p15 #0: Fri Aug 19 12:13:37 JST 2022     root@www3666.sakura.ne.jp:/usr/obj/home/pkg/src/sys/GENERIC  amd64


Perl modules
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strict .......................... Ok
Sys::Hostname ................... Ok
POSIX ........................... Ok
Errno ........................... Ok
IO::Socket ...................... Ok
IO::Select ...................... Ok

Local server test
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Ok

DNS <TCP> client test (209.242.128.100)
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Error > Can't connect > Address family not supported by protocol family