And Mozilla::CA?

Yep -I think you nailed it.
SP-5.24.3 ships with Mozilla-CA-20160104, whereas SP-5.24.4 ships with Mozilla-CA-20180117.
When I update SP-5.24.3 to Mozilla-CA-20180117 the problem goes away.

Cheers,
Rob

In reply to Re^4: WWW::Mechanize cannot connect to HTTPS site by syphilis
in thread WWW::Mechanize cannot connect to HTTPS site by Marshall

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