# Igntion OPC UA loopback server fault **URL:** \ **Category:** Ignition\ **Tags:** ignition81\ **Created:** [January 3, 2023, 12:42pm UTC](https://forum.inductiveautomation.com/t/igntion-opc-ua-loopback-server-fault/68156 "2023-01-03T12:42:06Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Kartik\_I](https://avatars.discourse-cdn.com/v4/letter/k/8c91f0/32.png) [@Kartik\_I](https://forum.inductiveautomation.com/u/Kartik_I)\ **Post date:** [January 3, 2023, 12:42pm UTC](https://forum.inductiveautomation.com/t/igntion-opc-ua-loopback-server-fault/68156/1 "2023-01-03T12:42:06Z")
Hello Team, ``` I am facing this error for Igntion OPC loopback server. The server is stated faulted please help me out to resolve the issue. I am attaching error pic with error log. ``` UaException: status=Bad\_ConnectionRejected, message=io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: no further information: localhost/127.0.0.1:62541 at org.eclipse.milo.opcua.stack.client.transport.uasc.ClientChannelFsm$ClientChannelActions.lambda$connect$0(ClientChannelFsm.java:129) at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:578) at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:571) at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:550) at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:491) at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:616) at io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:609) at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:117) at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:321) at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:337) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:710) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:658) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:584) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:496) at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:995) at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) at java.base/java.lang.Thread.run(Unknown Source) Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: no further information: localhost/127.0.0.1:62541 Caused by: java.net.ConnectException: Connection refused: no further information at java.base/sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at java.base/sun.nio.ch.SocketChannelImpl.finishConnect(Unknown Source) at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:337) at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:710) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:658) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:584) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:496) at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:995) at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) at java.base/java.lang.Thread.run(Unknown Source) 8.1.23 (b2022121308) Azul Systems, Inc. 11.0.16.1 ![MicrosoftTeams-image (1)](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/7/a77c9bdc349ea7381cdddfa31cd8761b4bf842d2.png) Thanks Kartik I ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [January 3, 2023, 1:28pm UTC](https://forum.inductiveautomation.com/t/igntion-opc-ua-loopback-server-fault/68156/2 "2023-01-03T13:28:02Z")
Please fix your post. Remove the leading blanks from your paragraph--that's messing up its formatting. Place triple back-quotes on a line above and a line below the error backtrace, so it will be "Pre-formatted". Or highlight all of the backtrace text and use the pre-formatted text button. (You've been told this before. Please help us help you.) ---
**Author:** ![justinedwards.jle](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/justinedwards.jle/32/37854_2.png) [@justinedwards.jle](https://forum.inductiveautomation.com/u/justinedwards.jle)\ **Post date:** [January 4, 2023, 2:38am UTC](https://forum.inductiveautomation.com/t/igntion-opc-ua-loopback-server-fault/68156/3 "2023-01-04T02:38:06Z")
```auto Here are a few questions that could give you some directions to go in. Are there any other software programs that could possibly be using that port? Have there been any recent changes to your firewall that could be causing the issue? Are you sure the server is running? ``` ---
**Author:** ![Kartik\_I](https://avatars.discourse-cdn.com/v4/letter/k/8c91f0/32.png) [@Kartik\_I](https://forum.inductiveautomation.com/u/Kartik_I)\ **Post date:** [January 4, 2023, 4:10am UTC](https://forum.inductiveautomation.com/t/igntion-opc-ua-loopback-server-fault/68156/4 "2023-01-04T04:10:09Z")
Hello @justinedwards.jle here are your answers. ``` 1. There are no softwares using that port. 2. No any changes other than opening 62541 port. 3. Yes the server is running. ``` Thanks, Kartik I ---
**Author:** ![justinedwards.jle](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/justinedwards.jle/32/37854_2.png) [@justinedwards.jle](https://forum.inductiveautomation.com/u/justinedwards.jle)\ **Post date:** [January 4, 2023, 4:21am UTC](https://forum.inductiveautomation.com/t/igntion-opc-ua-loopback-server-fault/68156/5 "2023-01-04T04:21:54Z")
```auto In that case, I recommend reaching out to support. Please report back with the solution! ```