Why am I getting “Received fatal alert: protocol_version” or “peer not authenticated” from Maven Central?

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I'm getting the above errors when connecting to Maven Central / https://repo1.maven.org after June 18th 2018.


In June 2018, in an effort to raise security and comply with modern standards, the insecure TLS 1.0 & 1.1 protocols will no longer be supported for SSL connections to Central. This should only affect users of Java 6 that are also using https to access central, which by our metrics is less than .2% of users.

For more details and workarounds, see the blog and faq here: https://blog.sonatype.com/enhancing-ssl-security-and-http/2-support-for-central


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