‘UnknownHostException’ errors observed in Adobe Connect 12 installation

[12-08 09:27:45,869] RTCClient-startup (ERROR) error in initial download java.net.UnknownHostException: webrtc-client.adobeconnect.com         at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) ~[?:1.8.0_341]         at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:929) ~[?:1.8.0_341]         at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1330) ~[?:1.8.0_341]         at java.net.InetAddress.getAllByName0(InetAddress.java:1283) ~[?:1.8.0_341]         at java.net.InetAddress.getAllByName(InetAddress.java:1199) ~[?:1.8.0_341]         at java.net.InetAddress.getAllByName(InetAddress.java:1127) ~[?:1.8.0_341]         at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45) ~[?:?]         at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:112) ~[?:?]         at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:376) ~[?:?]         at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:393) ~[?:?]         at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236) ~[?:?]         at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186) ~[?:?]         at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89) ~[?:?]         at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110) ~[?:?]         at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185) ~[?:?]         at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83) ~[?:?]         at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108) ~[?:?]         at com.adobe.connect.webrtc.WebRTCClientSynchronizer.downloadAndInstallUpdatedWebRTCClient(WebRTCClientSynchronizer.java:299) ~[?:?]