Hi Creig,
After that mango application become unreachable, login page also to coming.
below is the error also present in log file.
Error: E_MISSING_MESSAGE: Missing required message content `dsEdit.egaugePoint`.
at r (http://172.30.66.119:8080/ui/mangoUi~ngMango~ngMangoServices.js?v=eb9217569c6ceceefbda:61:427)
at a (http://172.30.66.119:8080/ui/mangoUi~ngMango~ngMangoServices.js?v=eb9217569c6ceceefbda:61:583)
at null (http://172.30.66.119:8080/ui/mangoUi~ngMango~ngMangoServices.js?v=eb9217569c6ceceefbda:117:14615)
at Function.t.messageFormatter.t.messageFormatter (http://172.30.66.119:8080/ui/mangoUi~ngMango~ngMangoServices.js?v=eb9217569c6ceceefbda:117:14703)
at Function.trSync (http://172.30.66.119:8080/ui/mangoUi~ngMango~ngMangoServices.js?v=eb9217569c6ceceefbda:72:109051)
at null (http://172.30.66.119:8080/ui/mangoUi~ngMango~ngMangoServices.js?v=eb9217569c6ceceefbda:72:108351)
at null (http://172.30.66.119:8080/ui/mangoUi~ngMango~ngMangoServices.js?v=eb9217569c6ceceefbda:78:94777)
at null (http://172.30.66.119:8080/ui/mangoUi~ngMango~ngMangoServices.js?v=eb9217569c6ceceefbda:78:94915)
at c.$digest (http://172.30.66.119:8080/ui/mangoUi~ngMango~ngMangoServices.js?v=eb9217569c6ceceefbda:78:100341)
at c.$apply (http://172.30.66.119:8080/ui/mangoUi~ngMango~ngMangoServices.js?v=eb9217569c6ceceefbda:78:102518)
WARN 2020-03-03T07:37:49,795 (org.eclipse.jetty.websocket.common.extensions.compress.CompressExtension$Flusher.failed:455) -
java.nio.channels.ClosedChannelException: null
at org.eclipse.jetty.websocket.common.io.FrameFlusher.enqueue(FrameFlusher.java:109) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.outgoingFrame(AbstractWebSocketConnection.java:582) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.websocket.common.extensions.AbstractExtension.nextOutgoingFrame(AbstractExtension.java:155) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.websocket.common.extensions.compress.PerMessageDeflateExtension.nextOutgoingFrame(PerMessageDeflateExtension.java:123) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.websocket.common.extensions.compress.CompressExtension.access$1100(CompressExtension.java:44) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.websocket.common.extensions.compress.CompressExtension$Flusher.compress(CompressExtension.java:591) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.websocket.common.extensions.compress.CompressExtension$Flusher.deflate(CompressExtension.java:488) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.websocket.common.extensions.compress.CompressExtension$Flusher.process(CompressExtension.java:468) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.util.IteratingCallback.processing(IteratingCallback.java:241) ~[jetty-util-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.util.IteratingCallback.iterate(IteratingCallback.java:223) ~[jetty-util-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.websocket.common.extensions.compress.CompressExtension.outgoingFrame(CompressExtension.java:244) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.websocket.common.extensions.ExtensionStack$Flusher.process(ExtensionStack.java:400) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.util.IteratingCallback.processing(IteratingCallback.java:241) ~[jetty-util-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.util.IteratingCallback.iterate(IteratingCallback.java:223) ~[jetty-util-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.websocket.common.extensions.ExtensionStack.outgoingFrame(ExtensionStack.java:277) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.websocket.common.WebSocketSession.outgoingFrame(WebSocketSession.java:355) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.websocket.common.WebSocketRemoteEndpoint.uncheckedSendFrame(WebSocketRemoteEndpoint.java:306) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.websocket.common.WebSocketRemoteEndpoint.sendAsyncFrame(WebSocketRemoteEndpoint.java:240) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at org.eclipse.jetty.websocket.common.WebSocketRemoteEndpoint.sendStringByFuture(WebSocketRemoteEndpoint.java:403) ~[websocket-common-9.4.23.v20191118.jar:9.4.23.v20191118]
at com.serotonin.m2m2.web.mvc.rest.v1.websockets.MangoWebSocketHandler.sendStringMessageAsync(MangoWebSocketHandler.java:138) ~[?:?]
at com.serotonin.m2m2.web.mvc.rest.v1.websockets.MangoWebSocketHandler.sendMessage(MangoWebSocketHandler.java:99) ~[?:?]
at com.serotonin.m2m2.web.mvc.rest.v1.websockets.events.EventsWebSocketHandler.sendMessage(EventsWebSocketHandler.java:123) ~[?:?]
at com.serotonin.m2m2.web.mvc.rest.v1.websockets.events.EventsWebSocketHandler$EventsWebSocketListener.returnToNormal(EventsWebSocketHandler.java:209) ~[?:?]
at com.serotonin.m2m2.rt.event.UserEventMulticaster.returnToNormal(UserEventMulticaster.java:162) ~[mango-3.7.4.jar:?]
at com.serotonin.m2m2.rt.EventManagerImpl$EventNotifyWorkItem.execute(EventManagerImpl.java:1121) ~[mango-3.7.4.jar:?]
at com.serotonin.m2m2.rt.maint.BackgroundProcessingImpl$WorkItemRunnable.run(BackgroundProcessingImpl.java:671) ~[mango-3.7.4.jar:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[?:?]
at java.lang.Thread.run(Thread.java:830) [?:?]