# Unable to start Designer or Client ERROR "This Launch Jar Signature is invalid. Contact an administrator"

**URL:** <https://forum.inductiveautomation.com/t/unable-to-start-designer-or-client-error-this-launch-jar-signature-is-invalid-contact-an-administrator/96092>\
**Category:** Ignition\
**Created:** [September 17, 2024, 9:20pm UTC](https://forum.inductiveautomation.com/t/unable-to-start-designer-or-client-error-this-launch-jar-signature-is-invalid-contact-an-administrator/96092 "2024-09-17T21:20:40Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![jcoffman](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jcoffman/32/6429_2.png) [@jcoffman](https://forum.inductiveautomation.com/u/jcoffman)\
**Post date:** [September 24, 2024, 3:45pm UTC](https://forum.inductiveautomation.com/t/unable-to-start-designer-or-client-error-this-launch-jar-signature-is-invalid-contact-an-administrator/96092/15 "2024-09-24T15:45:54Z")

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Hey all,

If you are trying to debug certificate path issues on Windows within the launchers you have to do two things to see the evaluation:

1. next to the launcher's executable file (in this case `designerlauncher.exe` create a file with the name `designerlauncher.l4j.ini` and add a single line with the contents of `-Djava.security.debug=certpath` and save it.
2. run the exe from the command line and redirect the output like so:

```shell
"C:\Users\%USERNAME%\AppData\Roaming\Inductive Automation\Designer Launcher\designerlauncher.exe" 2> "C:\Users\%USERNAME%\Desktop\stderr.log" 1> "C:\Users\%USERNAME%\Desktop\stdout.log"

```

(Update the paths as required)

once you attempt to connect over https you should see the `stderr.log` file populated with the output from the jsse debugging.

I would recommend cleaning out your launcher configuration of other saved apps and altering the launchers logging level to something like trace to try to get a complete picture of what is happening.

EDIT: updated to designer launcher instead of the Vision Client Launcher.

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