Exception reported in a new install

I’ve recently installed a new opennms server with a new install of CentOS Linux release 7.4.1708 (Core). I followed the installation instruction at the opennms website. Everything seemed fine during the installation, but can’t open http://opennmserver:8980/opennms/. In the eventd.log, it shows the following exception. Would anyone have any suggestion of where I should look?



Thanks,

-Thomas

*** Eventd.log ***

2018-03-07 09:51:07,982 WARN  [Camel Thread #21 - NettyServerTCPWorker] i.n.c.AbstractChannelHandlerContext: Failed to mark a promise as failure because it has failed already: DefaultChannelPromise@4fe48617(failure: java.nio.channels.ClosedChannelException), unnotified cause: java.nio.channels.ClosedChannelException

            at io.netty.channel.AbstractChannel$AbstractUnsafe.write(...)(Unknown Source)



io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1

            at io.netty.buffer.AbstractReferenceCountedByteBuf.release0(AbstractReferenceCountedByteBuf.java:101) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]

            at io.netty.buffer.AbstractReferenceCountedByteBuf.release(AbstractReferenceCountedByteBuf.java:89) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]

            at io.netty.util.ReferenceCountUtil.release(ReferenceCountUtil.java:84) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]

            at io.netty.channel.AbstractChannel$AbstractUnsafe.write(AbstractChannel.java:793) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]

            at io.netty.channel.DefaultChannelPipeline$HeadContext.write(DefaultChannelPipeline.java:1291) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]

            at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738) [netty-all-4.1.9.Final.jar:4.1.9.Final]

            at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:730) [netty-all-4.1.9.Final.jar:4.1.9.Final]

            at io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:38) [netty-all-4.1.9.Final.jar:4.1.9.Final]

            at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:1089) [netty-all-4.1.9.Final.jar:4.1.9.Final]

            at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1136) [netty-all-4.1.9.Final.jar:4.1.9.Final]

            at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:1078) [netty-all-4.1.9.Final.jar:4.1.9.Final]

            at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) [netty-all-4.1.9.Final.jar:4.1.9.Final]

            at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:403) [netty-all-4.1.9.Final.jar:4.1.9.Final]

            at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:442) [netty-all-4.1.9.Final.jar:4.1.9.Final]

            at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) [netty-all-4.1.9.Final.jar:4.1.9.Final]

            at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]

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