Problem

Confluence is not currently supporting the use of TLS 1.3 due to its Java version

Environment

Adopt OpenJDK 11.0.7_10

Steps to Reproduce

Add the parameter sslEnabledProtocols="TLSv1.3"

Expected Results

Confluence is up and running.
Confluence is able to handshake with other apps

Actual Results

13-Nov-2020 10:30:24.188 SEVERE [main] org.apache.catalina.util.LifecycleBase.handleSubClassException Failed to initialize component [Connector[org.apache.coyote.http11.Http11Nio2Protocol-443]]
	org.apache.catalina.LifecycleException: Protocol handler initialization failed

Workaround

Remove the TLS 1.3 parameter from the server.xml and setenv.sh.
If using Windows as a Service, remove the TLSv1.3 parameter from -Djdk.tls.client.protocols and -Djdk.tls.server.protocols.

Notes

If Jira enabled TLS 1.3, the application link between Confluence and Jira will try to handshake with 1.3 and that won't work.
Please consider removing the parameter on both sides before creating the app link.