Jenkins Slave SSL Handshake failure

Question

My Master Jenkins is running on an Ubuntu VM. Jenkins was installed via apt and the SSL termination takes place on an nginx, on the same server.

When I try to connect slaves, it does not work. The slaves, at least on VM level, report an SSL error.

The slaves in Kubernetes terminate immediately and I have no access to the logs.

How can I solve the problem with the SSL? My certificate is an official, purchased certificate.

var/lib/jenkins# java -jar agent.jar -jnlpUrl https://jenkins.example.com/computer/jr1/jenkins-agent.jnlp -secret XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX -workDir "/var/lib/jenkins"
Apr 12, 2022 6:43:59 PM org.jenkinsci.remoting.engine.WorkDirManager initializeWorkDir
INFO: Using /var/lib/jenkins/remoting as a remoting work directory
Apr 12, 2022 6:43:59 PM org.jenkinsci.remoting.engine.WorkDirManager setupLogging
INFO: Both error and output logs will be printed to /var/lib/jenkins/remoting
Exception in thread "main" javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure
        at sun.security.ssl.Alert.createSSLException(Alert.java:131)
        at sun.security.ssl.Alert.createSSLException(Alert.java:117)
        at sun.security.ssl.TransportContext.fatal(TransportContext.java:311)
        at sun.security.ssl.Alert$AlertConsumer.consume(Alert.java:293)
        at sun.security.ssl.TransportContext.dispatch(TransportContext.java:185)
        at sun.security.ssl.SSLTransport.decode(SSLTransport.java:152)
        at sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1392)
        at sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1300)
        at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:435)
        at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
        at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:197)
        at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:167)
        at hudson.remoting.Launcher.parseJnlpArguments(Launcher.java:508)
        at hudson.remoting.Launcher.run(Launcher.java:346)
        at hudson.remoting.Launcher.main(Launcher.java:297)