Save fails after a few minutes in 8.3.6 (Project disappear ?)

Aiasa21 · April 29, 2026, 3:54pm

Hi everyone,

I am currently setting up a new server to test the migration of a Perspective project from Ignition 8.1 to 8.3.6.

I am experiencing a recurring issue with the Designer. After a few minutes of use, if I try to save my work or perform actions like creating Tag Groups, this error pops up:

Full error:

com.inductiveautomation.ignition.common.rpc.RpcException: Unexpected status code: 403
	at com.inductiveautomation.ignition.client.gateway_interface.GatewayInterface.invokeRaw(GatewayInterface.java:417)
	at com.inductiveautomation.ignition.client.gateway_interface.GatewayInterface.invoke(GatewayInterface.java:366)
	at com.inductiveautomation.ignition.client.gateway_interface.GatewayConnection$Rpc$RpcInvocationHandler.invoke(GatewayConnection.java:317)
	at jdk.proxy2/jdk.proxy2.$Proxy8.canSaveProject(Unknown Source)
	at com.inductiveautomation.ignition.designer.IgnitionDesigner.handleSave(IgnitionDesigner.java:1396)
	at com.inductiveautomation.ignition.designer.IgnitionDesigner$Handler.lambda$handleSaveAction$12(IgnitionDesigner.java:2773)
	at com.inductiveautomation.ignition.client.util.gui.progress.Task$FunctionWrapper.apply(Task.java:259)
	at com.inductiveautomation.ignition.client.util.gui.progress.Task$FunctionWrapper.apply(Task.java:249)
	at com.inductiveautomation.ignition.client.util.gui.progress.Task.lambda$runInternal$3(Task.java:215)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)

Ignition v8.3.6 (b2026042713)
Java: Azul Systems, Inc. 17.0.18

The timing seems inconsistent, but once the error occurs, if I go to File > Open (without saving the current project), the project selection window appears completely empty.

Full error:

java.util.concurrent.ExecutionException: java.lang.reflect.UndeclaredThrowableException
	at java.base/java.util.concurrent.CompletableFuture.reportGet(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture.get(Unknown Source)
	at com.inductiveautomation.ignition.client.util.gui.progress.Task.runBlocking(Task.java:151)
	at com.inductiveautomation.ignition.client.util.gui.progress.Task.runBlocking(Task.java:128)
	at com.inductiveautomation.ignition.designer.ProjectDialog.<init>(ProjectDialog.java:123)
	at com.inductiveautomation.ignition.designer.IgnitionDesigner$Handler.handleOpen(IgnitionDesigner.java:2994)
	at com.inductiveautomation.ignition.designer.IgnitionDesigner$Handler.handleOpen(IgnitionDesigner.java:2955)
	at com.inductiveautomation.ignition.client.util.action.BaseAction$BaseActionImpl.actionPerformed(BaseAction.java:188)
	at java.desktop/javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at java.desktop/javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at java.desktop/javax.swing.AbstractButton.doClick(Unknown Source)
	at java.desktop/javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
	at java.desktop/javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
	at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
	at java.desktop/java.awt.Component.processMouseEvent(Unknown Source)
	at java.desktop/javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.desktop/java.awt.Component.processEvent(Unknown Source)
	at java.desktop/java.awt.Container.processEvent(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
	at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.desktop/java.awt.EventQueue$5.run(Unknown Source)
	at java.desktop/java.awt.EventQueue$5.run(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.reflect.UndeclaredThrowableException
	at jdk.proxy2/jdk.proxy2.$Proxy8.getValidProjectManifests(Unknown Source)
	at com.inductiveautomation.ignition.designer.ProjectDialog.lambda$new$1(ProjectDialog.java:120)
	at com.inductiveautomation.ignition.client.util.gui.progress.Task.lambda$create$2(Task.java:107)
	at com.inductiveautomation.ignition.client.util.gui.progress.Task$FunctionWrapper.apply(Task.java:259)
	at com.inductiveautomation.ignition.client.util.gui.progress.Task$FunctionWrapper.apply(Task.java:249)
	at com.inductiveautomation.ignition.client.util.gui.progress.Task.lambda$runInternal$3(Task.java:215)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)
Caused by: com.inductiveautomation.ignition.common.rpc.RpcException: Unexpected status code: 403
	at com.inductiveautomation.ignition.client.gateway_interface.GatewayInterface.invokeRaw(GatewayInterface.java:417)
	at com.inductiveautomation.ignition.client.gateway_interface.GatewayInterface.invoke(GatewayInterface.java:366)
	at com.inductiveautomation.ignition.client.gateway_interface.GatewayConnection$Rpc$RpcInvocationHandler.invoke(GatewayConnection.java:317)
	... 11 more

Ignition v8.3.6 (b2026042713)
Java: Azul Systems, Inc. 17.0.18

Currently, the only way I figure out to get back to work is to force-close the Designer via Task Manager, restart it, and reopen the project (which is still there and visible upon restart).

Has anyone encountered this behavior?

paul-griffith · April 29, 2026, 4:00pm

What's your network topology look like?

What's happening suggests to me that your designer is making a connection and establishing a session, and then a few minutes later something about your local machine changes and the session you had on the backend is lost.

Check your gateway logs, they may have more details.

Aiasa21 · April 29, 2026, 4:06pm

This is the last log after the error

As an additional detail, I am currently connected via VPN. Tomorrow I will test without it to see if the issue persists.

However, the strange thing is that I am also connected to the production server (which is basically a "twin" machine running 8.1) over the exact same VPN, and I am not experiencing any connection drops there.

paul-griffith · April 29, 2026, 4:39pm

What's under "Websocket connection errored out"? The stacktrace there might be interesting.

I think that it's something with your VPN interacting poorly with the designer's persistent session(s).

You could also keep an eye on the gateway status page that lists active designer connections - I'm betting when this starts happening your extant designer connection will go "dormant" - to the gateway, your existing designer connection is disappearing.