On OSX it looks like the Eclipse updater doesn’t install the HTTPS certificate used for the update site. Use the following instructions to install it locally (courtesy of @geib, thanks for that!)
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Use for example InstallCert.java to download the certificate (https://github.com/escline/InstallCert).
java InstallCert erlide.org:443
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keytool -exportcert -alias erlide.org-1 -keystore jssecacerts -storepass changeit -file erlide.org.cer
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keytool -importcert -alias erlide.org -keystore /Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/security/cacerts -storepass changeit -file erlide.org.cer
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restart eclipse