# OPC UA SERVER not working - OPC UA SERVER faulted **URL:** \ **Category:** Ignition\ **Tags:** ignition81, opcua, ignition80\ **Created:** [May 7, 2025, 8:04am UTC](https://forum.inductiveautomation.com/t/opc-ua-server-not-working-opc-ua-server-faulted/105960 "2025-05-07T08:04:35Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Filippos\_Onisiforou](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/filippos_onisiforou/32/68090_2.png) [@Filippos\_Onisiforou](https://forum.inductiveautomation.com/u/Filippos_Onisiforou)\ **Post date:** [May 7, 2025, 8:04am UTC](https://forum.inductiveautomation.com/t/opc-ua-server-not-working-opc-ua-server-faulted/105960/1 "2025-05-07T08:04:35Z")
Hello Guys, i have this issue with the OPC UA server, i have check the previous topics about this issue tried them with no result. Any Idea what might be the problem ? We had a power failure yesterday some systems went down. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/c/2/c21d732316997319930b8d451f5b03a6aa4031f8.png) ---
**Author:** ![David\_Stone](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/david_stone/32/79749_2.png) [@David\_Stone](https://forum.inductiveautomation.com/u/David_Stone)\ **Post date:** [May 7, 2025, 9:39am UTC](https://forum.inductiveautomation.com/t/opc-ua-server-not-working-opc-ua-server-faulted/105960/2 "2025-05-07T09:39:35Z")
That error states that your user was denied access to the server. Check all your authentication and user settings on the OPC connections and server configuration. ---
**Author:** ![Filippos\_Onisiforou](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/filippos_onisiforou/32/68090_2.png) [@Filippos\_Onisiforou](https://forum.inductiveautomation.com/u/Filippos_Onisiforou)\ **Post date:** [May 7, 2025, 9:52am UTC](https://forum.inductiveautomation.com/t/opc-ua-server-not-working-opc-ua-server-faulted/105960/3 "2025-05-07T09:52:20Z")
Hi David thank you for your reply. Can you guide me through step by step ? ---
**Author:** ![Transistor](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/transistor/32/3380_2.png) [@Transistor](https://forum.inductiveautomation.com/u/Transistor)\ **Post date:** [May 7, 2025, 10:48am UTC](https://forum.inductiveautomation.com/t/opc-ua-server-not-working-opc-ua-server-faulted/105960/4 "2025-05-07T10:48:24Z")
> **[OPC UA Client Connection Settings | Ignition User Manual](https://www.docs.inductiveautomation.com/docs/8.1/ignition-modules/opc-ua/opc-ua-client-connection-settings)** > > Configuring an OPC Client Connection If you're still in trouble you'd need to show your settings for both ends of the connection. Post the error message - not an incomplete picture of it. Please see [Wiki - how to post code on this forum](https://forum.inductiveautomation.com/t/wiki-how-to-post-code-on-this-forum/77831). ---
**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:** [May 7, 2025, 10:57am UTC](https://forum.inductiveautomation.com/t/opc-ua-server-not-working-opc-ua-server-faulted/105960/5 "2025-05-07T10:57:11Z")
If you need urgent help for production, you should open a support ticket to get official IA assistance. This forum is full of volunteers. ---
**Author:** ![Filippos\_Onisiforou](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/filippos_onisiforou/32/68090_2.png) [@Filippos\_Onisiforou](https://forum.inductiveautomation.com/u/Filippos_Onisiforou)\ **Post date:** [May 7, 2025, 11:22am UTC](https://forum.inductiveautomation.com/t/opc-ua-server-not-working-opc-ua-server-faulted/105960/6 "2025-05-07T11:22:31Z")
Hi Transistor see Below. Let me know if you need anything else to check it out. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/2/7/27a7720389860c81950f88cba26d6c21eb7ae1b4.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/e/6/e60dcb28a64e80d3ca57504c5cf869fec6751f6f.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/7/d/7dd83580a56e66a97ef079db29a909394e373a59.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/5/e/5eecd696add9f8f718590e36c8fbf9c7acc8d516.png) ```python UaException: status=Bad_ConnectionRejected, message=io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: /192.168.12.40:62541 at org.eclipse.milo.opcua.stack.client.transport.uasc.ClientChannelFsm$ClientChannelActions.lambda$connect$0(ClientChannelFsm.java:129) at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:590) at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:583) at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:559) at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:492) at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:636) at io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:629) at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:118) at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:326) at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:342) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:776) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562) at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:994) 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: /192.168.12.40:62541 Caused by: java.net.ConnectException: Connection refused at java.base/sun.nio.ch.Net.pollConnect(Native Method) at java.base/sun.nio.ch.Net.pollConnectNow(Unknown Source) at java.base/sun.nio.ch.SocketChannelImpl.finishConnect(Unknown Source) at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:336) at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:339) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:776) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562) at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:994) at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) at java.base/java.lang.Thread.run(Unknown Source) 8.1.43 (b2024082010) Azul Systems, Inc. 17.0.11 ``` ---
**Author:** ![Filippos\_Onisiforou](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/filippos_onisiforou/32/68090_2.png) [@Filippos\_Onisiforou](https://forum.inductiveautomation.com/u/Filippos_Onisiforou)\ **Post date:** [May 9, 2025, 6:26am UTC](https://forum.inductiveautomation.com/t/opc-ua-server-not-working-opc-ua-server-faulted/105960/7 "2025-05-09T06:26:56Z")
Hi Phil , i was reading some older post of you about this issue. We increased the memory of the VM and now its working. Thank you. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/1/0/10929bf916ede95ab8f45aa5115df21b31843e71.png)