I am relatively new to Ignition and was recently woken up to face this issue and was hopeful you could help me out here.
In the OPC section of the web console the connection section, Connection -> “Ignition OPC-UA Server” was faulted. I pasted to logs below
Ignition Version is 7.9.6
I used the "Ignition Gateway control utility to restart and we were back and running.
UaException: status=Bad_ConnectionClosed, message=connection closed
at org.eclipse.milo.opcua.stack.client.handlers.UaTcpClientMessageHandler.channelInactive(UaTcpClientMessageHandler.java:164)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:193)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:179)
at io.netty.handler.codec.ByteToMessageDecoder.channelInputClosed(ByteToMessageDecoder.java:349)
at io.netty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:309)
at io.netty.handler.codec.ByteToMessageCodec.channelInactive(ByteToMessageCodec.java:118)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:193)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:179)
at io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:944)
at io.netty.channel.AbstractChannel$AbstractUnsafe$7.run(AbstractChannel.java:687)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:358)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:374)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)
at java.lang.Thread.run(Unknown Source)
7.9.6 (b2018012914)
Oracle Corporation 1.8.0_211