# Cannot open a Designer and Client at the same time

**URL:** <https://forum.inductiveautomation.com/t/cannot-open-a-designer-and-client-at-the-same-time/6750>\
**Category:** Ignition\
**Created:** [June 22, 2013, 12:37am UTC](https://forum.inductiveautomation.com/t/cannot-open-a-designer-and-client-at-the-same-time/6750 "2013-06-22T00:37:28Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![lisawas](https://avatars.discourse-cdn.com/v4/letter/l/4bbf92/32.png) [@lisawas](https://forum.inductiveautomation.com/u/lisawas)\
**Post date:** [June 22, 2013, 12:37am UTC](https://forum.inductiveautomation.com/t/cannot-open-a-designer-and-client-at-the-same-time/6750/1 "2013-06-22T00:37:28Z")

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This morning, I updated to Java 7 Update 25 (build 1.7.0\_25-b16). Also this morning, we upgraded to Ignition 7.6.1. Suddenly, I found that I could not open a Designer and Client at the same time. I can open one or the other, but must close the first before I can open the second.

When I attempt to open a second Ignition Client/Designer, I get the following error:

“Error launching application:  
JARSigningException: Could not verify signing in resource:  
[172.28.33.236:80/main/system/jar … client.jar](http://172.28.33.236:80/main/system/jar/m/laughclient.jar)”

For completeness sake, I tried opening two Designers, or two Clients. Both attempts failed with the same error.

I am running Windows 7 Enterprise w/ Service Pack 1.

My coworker appears to be having the same issue.

We use Firefox 17.0.6 to launch the applications initially. Not sure if that affects anything.

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**Author:** ![mgross](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/mgross/32/3311_2.png) [@mgross](https://forum.inductiveautomation.com/u/mgross)\
**Post date:** [June 24, 2013, 3:52pm UTC](https://forum.inductiveautomation.com/t/cannot-open-a-designer-and-client-at-the-same-time/6750/2 "2013-06-24T15:52:29Z")

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This was caused by a build issue with 7.6.1, which has been fixed in 7.6.2-rc4. There is a workaround [in this post](http://inductiveautomation.com/forum/viewtopic.php?f=72&t=10496) that can eliminate the issue.

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**Author:** ![lisawas](https://avatars.discourse-cdn.com/v4/letter/l/4bbf92/32.png) [@lisawas](https://forum.inductiveautomation.com/u/lisawas)\
**Post date:** [June 24, 2013, 11:19pm UTC](https://forum.inductiveautomation.com/t/cannot-open-a-designer-and-client-at-the-same-time/6750/3 "2013-06-24T23:19:40Z")

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Thank you. That seems to have fixed it.