CentOS 7 3.1.6

oxtrust         | 2019-06-11 20:48:09,794 WARN  [Thread-191] [org.gluu.oxtrust.ldap.service.StatusCheckerTimer] (StatusCheckerTimer.java:317) - +++++++++++++++++++++++++++++++++
oxtrust         | 2019-06-11 20:48:11,809 ERROR [Thread-191] [org.gluu.oxtrust.ldap.service.StatusCheckerTimer] (StatusCheckerTimer.java:207) - Can not download ssl certificate
oxtrust         | java.net.NoRouteToHostException: Host is unreachable (Host unreachable)
oxtrust         |   at java.net.PlainSocketImpl.socketConnect(Native Method) ~[?:1.8.0_212]
oxtrust         |   at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[?:1.8.0_212]
oxtrust         |   at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[?:1.8.0_212]
oxtrust         |   at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[?:1.8.0_212]
oxtrust         |   at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[?:1.8.0_212]
oxtrust         |   at java.net.Socket.connect(Socket.java:589) ~[?:1.8.0_212]
oxtrust         |   at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:666) ~[?:1.8.0_212]
oxtrust         |   at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173) ~[?:1.8.0_212]
oxtrust         |   at sun.net.NetworkClient.doConnect(NetworkClient.java:180) ~[?:1.8.0_212]
oxtrust         |   at sun.net.www.http.HttpClient.openServer(HttpClient.java:463) ~[?:1.8.0_212]
oxtrust         |   at sun.net.www.http.HttpClient.openServer(HttpClient.java:558) ~[?:1.8.0_212]
oxtrust         |   at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264) ~[?:1.8.0_212]
oxtrust         |   at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367) ~[?:1.8.0_212]
oxtrust         |   at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191) ~[?:1.8.0_212]