Atlassian Marketplace server not reachable due to "javax.net.ssl.SSLException: Received fatal alert: protocol_version"
Platform Notice: Server and Data Center Only - This article only applies to Atlassian products on the server and data center platforms.
Confluence is unable to reach the Atlassian Marketplace over HTTPS.
After Confluence tries to reach the Marketplace, an error like the following appears in the application logs:
2021-01-11 17:17:12,457 WARN [https-jsse-nio-443-exec-64] [atlassian.upm.pac.PacClientImpl] fetchMpacAppInfo Error when querying application info from MPAC: com.atlassian.marketplace.client.MpacException: javax.net.ssl.SSLException: Received fatal alert: protocol_version -- referer: https://my.confluence.com/plugins/servlet/upm/marketplace/featured?source=side_nav_find_new_addons | url: /plugins/servlet/upm | traceId: 31a652053a96ebbe | userName: BBunny
Check the Java options used to start up Confluence for an incorrect TLS client protocol. For example:
Remove the offending TLS client protocol entry using Configuring System Properties as a guide and restart Confluence.