As seen by https://www.ssllabs.com/ssltest/analyze.html?d=contests.arrl.org :
Path #1: Trusted
1 Sent by server *.arrl.org
2 Extra download Go Daddy Secure Certificate Authority - G2
3 In trust store Go Daddy Root Certificate Authority - G2
So yes, that website forgot to include the intermediate chain file. Firefox is willing to download it, but neither Perl nor Curl are. Maybe there's an SSL setting to eable downloads of intermediate certs?

In reply to Re: Mechanize - Bad File descriptor by NERDVANA
in thread Mechanize - Bad File descriptor by Marshall

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