I'm currently using the swarm plugin to connect all my slaves to the master. However, whenever the Jenkins service on the master gets restarted, the Jenkins slave will remain offline. It will only come back online when I restart the jenkins swarm plugin process.

Nov 11, 2015 10:06:32 AM org.apache.commons.httpclient.HttpMethodBase getResponseBody
WARNING: Going to buffer response body of large or unknown size. Using getResponseBodyAsStream instead is recommended.
Attempting to connect to https://suct2v420.it.mgt:8443/ 98ecac62-d76a-4734-9f9f-9350ee5b4e7d with ID c3c7e53b
Could not obtain CSRF crumb. Response code: 404
javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: No name matching suct2v420.it.mgt found
at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1904)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:279)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:273)
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1446)
at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:209)
at sun.security.ssl.Handshaker.processLoop(Handshaker.java:901)
at sun.security.ssl.Handshaker.process_record(Handshaker.java:837)
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1023)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1332)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1359)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1343)
at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:563)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:153)
at hudson.remoting.Launcher.parseJnlpArguments(Launcher.java:269)
at hudson.plugins.swarm.SwarmClient.connect(SwarmClient.java:229)
at hudson.plugins.swarm.Client.run(Client.java:106)
at hudson.plugins.swarm.Client.main(Client.java:69)
Caused by: java.security.cert.CertificateException: No name matching suct2v420.it.mgt found
at sun.security.util.HostnameChecker.matchDNS(HostnameChecker.java:208)
at sun.security.util.HostnameChecker.match(HostnameChecker.java:93)
at sun.security.ssl.X509TrustManagerImpl.checkIdentity(X509TrustManagerImpl.java:347)
at sun.security.ssl.AbstractTrustManagerWrapper.checkAdditionalTrust(SSLContextImpl.java:919)
at sun.security.ssl.AbstractTrustManagerWrapper.checkServerTrusted(SSLContextImpl.java:886)
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1428)
... 14 more
Failed to establish JNLP connection to https://suct2v420.it.mgt:8443/
Retrying in 10 seconds