# Ignition launch client jar invalid how to fix

**URL:** <https://forum.inductiveautomation.com/t/ignition-launch-client-jar-invalid-how-to-fix/105644>\
**Category:** Ignition\
**Tags:** ignition79, ignition80, ignition81\
**Created:** [April 28, 2025, 6:35pm UTC](https://forum.inductiveautomation.com/t/ignition-launch-client-jar-invalid-how-to-fix/105644 "2025-04-28T18:35:49Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![rpap](https://avatars.discourse-cdn.com/v4/letter/r/bbce88/32.png) [@rpap](https://forum.inductiveautomation.com/u/rpap)\
**Post date:** [April 28, 2025, 6:35pm UTC](https://forum.inductiveautomation.com/t/ignition-launch-client-jar-invalid-how-to-fix/105644/1 "2025-04-28T18:35:49Z")

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Unable to launch ignition  
Opens locally on the machie but not via VPN  
ignition launch client jar invalid

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/5/1/51c8299672529c0a052b61cd33e428f9de3bff9e.png)

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**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:** [April 28, 2025, 6:38pm UTC](https://forum.inductiveautomation.com/t/ignition-launch-client-jar-invalid-how-to-fix/105644/2 "2025-04-28T18:38:39Z")

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This thread has a lot of troubleshooting options and solutions, but I'm linking specifically to a post with directions on how to get detailed logs to start troubleshooting: [Unable to start Designer or Client ERROR "This Launch Jar Signature is invalid. Contact an administrator" - #6 by Kevin.Herron](https://forum.inductiveautomation.com/t/unable-to-start-designer-or-client-error-this-launch-jar-signature-is-invalid-contact-an-administrator/96092/6)

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**Author:** ![rpap](https://avatars.discourse-cdn.com/v4/letter/r/bbce88/32.png) [@rpap](https://forum.inductiveautomation.com/u/rpap)\
**Post date:** [April 28, 2025, 6:40pm UTC](https://forum.inductiveautomation.com/t/ignition-launch-client-jar-invalid-how-to-fix/105644/3 "2025-04-28T18:40:28Z")

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On the firewall, I see launchclient.jar file getting denied, could that be an issue

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**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:** [April 28, 2025, 6:40pm UTC](https://forum.inductiveautomation.com/t/ignition-launch-client-jar-invalid-how-to-fix/105644/4 "2025-04-28T18:40:34Z")

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Yes.

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<div class="post-metadata">

**Author:** ![rpap](https://avatars.discourse-cdn.com/v4/letter/r/bbce88/32.png) [@rpap](https://forum.inductiveautomation.com/u/rpap)\
**Post date:** [April 28, 2025, 6:40pm UTC](https://forum.inductiveautomation.com/t/ignition-launch-client-jar-invalid-how-to-fix/105644/5 "2025-04-28T18:40:54Z")

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Thanks

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**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:** [April 28, 2025, 7:57pm UTC](https://forum.inductiveautomation.com/t/ignition-launch-client-jar-invalid-how-to-fix/105644/6 "2025-04-28T19:57:21Z")

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You've tagged it as `ignition81, ignition80, ignition79`.  
Is it really all three versions?

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**Author:** ![rpap](https://avatars.discourse-cdn.com/v4/letter/r/bbce88/32.png) [@rpap](https://forum.inductiveautomation.com/u/rpap)\
**Post date:** [April 28, 2025, 8:44pm UTC](https://forum.inductiveautomation.com/t/ignition-launch-client-jar-invalid-how-to-fix/105644/7 "2025-04-28T20:44:05Z")

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Not sure which one it is