# OPC-UA connection to .NET Sample **URL:** \ **Category:** Ignition\ **Created:** [February 23, 2016, 5:12pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-net-sample/11258 "2016-02-23T17:12:35Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![cmello](https://avatars.discourse-cdn.com/v4/letter/c/91b2a8/32.png) [@cmello](https://forum.inductiveautomation.com/u/cmello)\ **Post date:** [February 23, 2016, 5:12pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-net-sample/11258/1 "2016-02-23T17:12:35Z")
Hi, We are evaluating interoperability with our UA Server based on the UA .NET Samples available here: [http://opcfoundation.github.io/UA-.NET/](http://opcfoundation.github.io/UA-.NET/) The connection works, but the browse fails with a dialog box showing the error below. Thank you very much for the attention! Best regards Mello com.inductiveautomation.ignition.client.gateway\_interface.GatewayException: java.lang.IllegalArgumentException at com.inductiveautomation.ignition.client.gateway\_interface.GatewayInterface.newGatewayException(GatewayInterface.java:327) at com.inductiveautomation.ignition.client.gateway\_interface.GatewayInterface.sendMessage(GatewayInterface.java:297) at com.inductiveautomation.ignition.client.gateway\_interface.GatewayInterface.invokeWithTimeout(GatewayInterface.java:896) at com.inductiveautomation.ignition.client.gateway\_interface.GatewayInterface.browseOPC(GatewayInterface.java:900) at com.inductiveautomation.ignition.designer.sqltags.opcbrowser.OPCFolderNode.loadChildren(OPCFolderNode.java:52) at com.inductiveautomation.ignition.client.util.gui.tree.AbstractAsynchronousTreeNode$Loader.run(AbstractAsynchronousTreeNode.java:75) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: java.util.concurrent.ExecutionException com.inductiveautomation.ignition.common.GenericTransferrableException: java.lang.IllegalArgumentException at java.util.concurrent.CompletableFuture.reportGet(Unknown Source) at java.util.concurrent.CompletableFuture.get(Unknown Source) at com.inductiveautomation.xopc2.client.OpcUaConnection.browse(OpcUaConnection.java:442) at com.inductiveautomation.ignition.gateway.opc.OPCManagerImpl$ServerWrapper.browse(OPCManagerImpl.java:703) at com.inductiveautomation.ignition.gateway.opc.OPCManagerImpl.browse(OPCManagerImpl.java:426) at com.inductiveautomation.ignition.gateway.sqltags.tagproviders.internal.InternalSQLTagsProvider.browseOPC(InternalSQLTagsProvider.java:78) at com.inductiveautomation.ignition.gateway.sqltags.providers.RedundantProviderWrapper.browseOPC(RedundantProviderWrapper.java:174) at com.inductiveautomation.ignition.gateway.sqltags.SQLTagsManagerImpl.browseOPC(SQLTagsManagerImpl.java:921) at com.inductiveautomation.ignition.gateway.project.ProjectSettingsCache$ProjectDefaultTagManagerFacade.browseOPC(ProjectSettingsCache.java:482) at com.inductiveautomation.ignition.gateway.servlets.gateway.functions.SQLTags.browseOPC(SQLTags.java:826) at sun.reflect.GeneratedMethodAccessor62.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.inductiveautomation.ignition.gateway.clientcomm.progress.MethodInvokeRunnable.run(MethodInvokeRunnable.java:27) at com.inductiveautomation.ignition.gateway.clientcomm.progress.GatewayProgressManagerImpl$GatewayProgressTask.run(GatewayProgressManagerImpl.java:233) at com.inductiveautomation.ignition.common.execution.impl.BasicExecutionEngine$ThrowableCatchingRunnable.run(BasicExecutionEngine.java:537) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) … 3 more Caused by: java.lang.IllegalArgumentException com.inductiveautomation.ignition.common.GenericTransferrableException at com.google.common.base.Preconditions.checkArgument(Preconditions.java:108) at com.google.common.collect.Lists.partition(Lists.java:653) at com.inductiveautomation.xopc2.client.OpcUaConnection.lambda$null$39(OpcUaConnection.java:488) at java.util.concurrent.CompletableFuture.uniCompose(Unknown Source) at java.util.concurrent.CompletableFuture$UniCompose.tryFire(Unknown Source) at java.util.concurrent.CompletableFuture.postComplete(Unknown Source) at java.util.concurrent.CompletableFuture.complete(Unknown Source) at com.digitalpetri.opcua.stack.client.UaTcpStackClient.receiveResponse(UaTcpStackClient.java:280) at com.digitalpetri.opcua.stack.client.UaTcpStackClient.lambda$sendRequest$9(UaTcpStackClient.java:151) at java.util.concurrent.CompletableFuture.uniWhenComplete(Unknown Source) at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(Unknown Source) at java.util.concurrent.CompletableFuture.postComplete(Unknown Source) at java.util.concurrent.CompletableFuture.complete(Unknown Source) at com.digitalpetri.opcua.stack.client.handlers.UaTcpClientSymmetricHandler.lambda$null$26(UaTcpClientSymmetricHandler.java:215) … 3 more Ignition v7.8.1 (b2016012216) Java: Oracle Corporation 1.8.0\_74 ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [February 23, 2016, 5:22pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-net-sample/11258/2 "2016-02-23T17:22:00Z")
It’s hard to tell, but I think this is a bug that has been fixed in the next release of our OPC-UA module. What’s happening is that the .NET server is returning 0 in response Ignition’s UA client reading one of the operation limit nodes, and it’s not correctly handling this case. Get in touch with support and they can send you the latest build of the UA module, or you can wait until the 7.8.2 release candidate appears in the next day or two and get it from there. ---
**Author:** ![cmello](https://avatars.discourse-cdn.com/v4/letter/c/91b2a8/32.png) [@cmello](https://forum.inductiveautomation.com/u/cmello)\ **Post date:** [February 23, 2016, 5:52pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-net-sample/11258/3 "2016-02-23T17:52:03Z")
Thank you a lot for the attention Kevin! And congratulations for the great product. I can wait the release, no hurry because we are just evaluating UA interop. Best regards! Mello