# "Launch client jar signature is invalid" error **URL:** \ **Category:** Ignition\ **Tags:** vision\ **Created:** [October 8, 2025, 5:58pm UTC](https://forum.inductiveautomation.com/t/launch-client-jar-signature-is-invalid-error/111292 "2025-10-08T17:58:34Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Ryan\_Smith](https://avatars.discourse-cdn.com/v4/letter/r/7cd45c/32.png) [@Ryan\_Smith](https://forum.inductiveautomation.com/u/Ryan_Smith)\ **Post date:** [October 8, 2025, 5:58pm UTC](https://forum.inductiveautomation.com/t/launch-client-jar-signature-is-invalid-error/111292/1 "2025-10-08T17:58:34Z")
Hi all, I am having this issue ![2025-10-08 09_26_40-Rockwell Windows 10 x64 - VMware Workstation](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/6/d63343413ee3e180983249d70b9ce6924e0d9c6d.png) This is on my VM through a VPN. I can bring up the gateway web page for this, but the vision client gives me this error. I can open the vision client on the server. Both my vm and the HMI server machine have correct time dictated by Windows. My vision log gives this info: `INFO [CompositeClassRejectListFilter] [2025/10/08 12:11:10]: Initialization performed successfully` `INFO [CompositeClassRejectListFilter] [2025/10/08 12:11:10]: JVM-wide ObjectInputFilter set up successfully` `INFO [CompositeClassRejectListFilter] [2025/10/08 12:11:10]: Platform serialFilter has 88 pattern(s)` `INFO [ClientLauncher] [2025/10/08 12:11:10]: Set initial logging level to INFO` `INFO [GatewayCommUtil] [2025/10/08 12:11:14]: Downloading "``http://172.25.60.115:8088/system/images/VisionIcon.ico``" (timeout=30)...` `to gateway ``http://172.25.60.115:8088``...` `INFO [GatewayCommUtil] [2025/10/08 12:11:20]: Downloading "``http://172.25.60.115:8088/system/images/VisionIcon.ico``" (timeout=30)...` `INFO [GatewayCommUtil] [2025/10/08 12:11:21]: Downloading "``http://172.25.60.115:8088/system/launchbin/launchclient.jar``" (timeout=30)...` `ERROR [LaunchClientJarService] [2025/10/08 12:11:21]: Launch client jar Invalid` `com.inductiveautomation.ignition.launcher.common.error.HttpResponseException` `at com.inductiveautomation.ignition.launcher.common.utils.GatewayCommUtil.getGatewayConnection(GatewayCommUtil.java:236)` `at com.inductiveautomation.ignition.launcher.common.utils.GatewayCommUtil.getGatewayConnection(GatewayCommUtil.java:148)` `at com.inductiveautomation.ignition.launcher.common.utils.GatewayCommUtil.downloadFile(GatewayCommUtil.java:535)` `at com.inductiveautomation.ignition.launcher.common.service.LaunchClientJarService$LaunchClientJarTask.lambda$downloadLaunchClientJar$3(LaunchClientJarService.java:363)` `at com.inductiveautomation.ignition.launcher.common.utils.FileUtils.runResourceLockedAction(FileUtils.java:111)` `at com.inductiveautomation.ignition.launcher.common.service.LaunchClientJarService$LaunchClientJarTask.downloadLaunchClientJar(LaunchClientJarService.java:361)` `at com.inductiveautomation.ignition.launcher.common.service.LaunchClientJarService$LaunchClientJarTask.getLaunchClientJar(LaunchClientJarService.java:228)` `at com.inductiveautomation.ignition.launcher.common.service.LaunchClientJarService$LaunchClientJarTask.call(LaunchClientJarService.java:168)` `at com.inductiveautomation.ignition.launcher.common.service.LaunchClientJarService$LaunchClientJarTask.call(LaunchClientJarService.java:140)` `at javafx.concurrent.Task$TaskCallable.call(Task.java:1426)` `at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)` `at javafx.concurrent.Service.lambda$executeTask$6(Service.java:727)` `at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)` `at javafx.concurrent.Service.lambda$executeTask$7(Service.java:726)` `at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)` `at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)` `at java.base/java.lang.Thread.run(Thread.java:840)` `ERROR [RuntimeException] [2025/10/08 12:11:26]: Uncaught exception in thread: JavaFX Application Thread` `java.lang.NullPointerException: Cannot invoke "java.net.MulticastSocket.leaveGroup(java.net.SocketAddress, java.net.NetworkInterface)" because "this.socket" is null` `at com.inductiveautomation.ignition.launcher.common.service.MulticastReceiverService.destroy(MulticastReceiverService.java:74)` `at com.inductiveautomation.ignition.launcher.common.ui.base.BaseLauncherApplication.stopGatewayServices(BaseLauncherApplication.java:292)` `at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)` `at com.inductiveautomation.ignition.launcher.common.ui.base.BaseLauncherApplication.lambda$onStageClosed$13(BaseLauncherApplication.java:503)` `at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)` `at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:234)` `at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)` `at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)` `at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)` `at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)` `at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)` `at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)` `at javafx.event.Event.fireEvent(Event.java:198)` `at javafx.stage.Window.fireEvent(Window.java:1405)` `at javafx.stage.Window$12.invalidated(Window.java:1164)` `at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110)` `at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145)` `at javafx.stage.Window.setShowing(Window.java:1211)` `at javafx.stage.Window.hide(Window.java:1236)` `at com.sun.javafx.stage.WindowCloseRequestHandler.dispatchBubblingEvent(WindowCloseRequestHandler.java:45)` `at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)` `at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)` `at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)` `at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)` `at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)` `at javafx.event.Event.fireEvent(Event.java:198)` `at com.sun.javafx.stage.WindowPeerListener.closing(WindowPeerListener.java:93)` `at com.sun.javafx.tk.quantum.GlassWindowEventHandler.run(GlassWindowEventHandler.java:147)` `at com.sun.javafx.tk.quantum.GlassWindowEventHandler.run(GlassWindowEventHandler.java:40)` `at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)` `at com.sun.javafx.tk.quantum.GlassWindowEventHandler.lambda$handleWindowEvent$4(GlassWindowEventHandler.java:178)` `at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:423)` `at com.sun.javafx.tk.quantum.GlassWindowEventHandler.handleWindowEvent(GlassWindowEventHandler.java:176)` `at com.sun.glass.ui.Window.handleWindowEvent(Window.java:1253)` `at com.sun.glass.ui.Window.notifyClose(Window.java:1158)` `at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)` `at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)` `at java.base/java.lang.Thread.run(Thread.java:840)` I’m not sure what to check next. Any help would be appreciated. ---
**Author:** ![Jacob\_Dipietro](https://avatars.discourse-cdn.com/v4/letter/j/82dd89/32.png) [@Jacob\_Dipietro](https://forum.inductiveautomation.com/u/Jacob_Dipietro)\ **Post date:** [October 8, 2025, 6:06pm UTC](https://forum.inductiveautomation.com/t/launch-client-jar-signature-is-invalid-error/111292/2 "2025-10-08T18:06:47Z")
Hey I might be completly off with this, but it looks like you have a similar issue to something mentioned on this post. Not sure of the details, but has the same error you have, so it might work. [Unable to start Designer or Client ERROR "This Launch Jar Signature is invalid. Contact an administrator" - #15 by jcoffman](https://forum.inductiveautomation.com/t/unable-to-start-designer-or-client-error-this-launch-jar-signature-is-invalid-contact-an-administrator/96092/15) They also mentioned this: [Launchers and Workstation | Ignition User Manual](https://docs.inductiveautomation.com/docs/8.3/launchers-and-workstation#signature-verification) ---
**Author:** ![Ryan\_Smith](https://avatars.discourse-cdn.com/v4/letter/r/7cd45c/32.png) [@Ryan\_Smith](https://forum.inductiveautomation.com/u/Ryan_Smith)\ **Post date:** [October 8, 2025, 6:07pm UTC](https://forum.inductiveautomation.com/t/launch-client-jar-signature-is-invalid-error/111292/3 "2025-10-08T18:07:09Z")
Based on those posts, I did change my signature security to LOOSE (even less checking that LENIENT) and deleted files in user/.ignition folder. No Luck ---
**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:** [October 8, 2025, 10:27pm UTC](https://forum.inductiveautomation.com/t/launch-client-jar-signature-is-invalid-error/111292/4 "2025-10-08T22:27:19Z")
Ryan, please see [Wiki - how to post code on this forum](https://forum.inductiveautomation.com/t/wiki-how-to-post-code-on-this-forum/77831). It limits the length of the code or error block on your post by putting it in a scrollable window. This prevents the posts getting ridiculously long. Can you edit to fix? ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [October 8, 2025, 10:43pm UTC](https://forum.inductiveautomation.com/t/launch-client-jar-signature-is-invalid-error/111292/5 "2025-10-08T22:43:56Z")
> [@Ryan\_Smith](#): > > [http://172.25.60.115:8088/system/launchbin/launchclient.jar](http://172.25.60.115:8088/system/launchbin/launchclient.jar) If you go to this address in a web browser, what happens? I suspect something in your environment (some security software installed by IT, perhaps) is preventing the download of this file by the launcher; the signature invalid error is a red herring. ---
**Author:** ![dgillbee](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/dgillbee/32/73838_2.png) [@dgillbee](https://forum.inductiveautomation.com/u/dgillbee)\ **Post date:** [October 8, 2025, 11:40pm UTC](https://forum.inductiveautomation.com/t/launch-client-jar-signature-is-invalid-error/111292/6 "2025-10-08T23:40:47Z")
Check your PC time. I've seen this when the PC launching the designer and the gateway are not time synchronized. ---
**Author:** ![Ryan\_Smith](https://avatars.discourse-cdn.com/v4/letter/r/7cd45c/32.png) [@Ryan\_Smith](https://forum.inductiveautomation.com/u/Ryan_Smith)\ **Post date:** [October 9, 2025, 4:05pm UTC](https://forum.inductiveautomation.com/t/launch-client-jar-signature-is-invalid-error/111292/7 "2025-10-09T16:05:05Z")
> [@Ryan\_Smith](#): > > [http://172.25.60.115:8088/system/launchbin/launchclient.jar](http://172.25.60.115:8088/system/launchbin/launchclient.jar) Yes! This is it. Our IT has on the down low, blocked this file download. It used to work, and now I know why it doesn’t. Thank you for this. Now, I have to go make an IT ticket and case for this to be unblocked. Fun.