# Checksum Mismatch Opening Designer

**URL:** <https://forum.inductiveautomation.com/t/checksum-mismatch-opening-designer/86992>\
**Category:** Ignition\
**Created:** [March 7, 2024, 8:47pm UTC](https://forum.inductiveautomation.com/t/checksum-mismatch-opening-designer/86992 "2024-03-07T20:47:31Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Oscar\_Saborio](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/oscar_saborio/32/32415_2.png) [@Oscar\_Saborio](https://forum.inductiveautomation.com/u/Oscar_Saborio)\
**Post date:** [March 7, 2024, 8:47pm UTC](https://forum.inductiveautomation.com/t/checksum-mismatch-opening-designer/86992/1 "2024-03-07T20:47:31Z")

</div>

Hello, I have this problem when I open the designer application. I don´t know how I can solve it

![Error Designer](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/3/d39ae877a5fdef422f494ee8d1104ba99a7d566e.png)

---

<div class="post-metadata">

**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:** [March 7, 2024, 8:52pm UTC](https://forum.inductiveautomation.com/t/checksum-mismatch-opening-designer/86992/2 "2024-03-07T20:52:55Z")

</div>

This is pretty much always a network or firewall issue; something is causing an incomplete or corrupt download of resources from the Ignition Gateway.

Do you have an IT department that you can ask?

---

<div class="post-metadata">

**Author:** ![Oscar\_Saborio](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/oscar_saborio/32/32415_2.png) [@Oscar\_Saborio](https://forum.inductiveautomation.com/u/Oscar_Saborio)\
**Post date:** [March 7, 2024, 8:58pm UTC](https://forum.inductiveautomation.com/t/checksum-mismatch-opening-designer/86992/3 "2024-03-07T20:58:49Z")

</div>

Hello Kevin

I will ask for the review.

It is a good posibility

Thanks a lot,

---

<div class="post-metadata">

**Author:** ![jparsons](https://avatars.discourse-cdn.com/v4/letter/j/ea666f/32.png) [@jparsons](https://forum.inductiveautomation.com/u/jparsons)\
**Post date:** [October 31, 2024, 6:16pm UTC](https://forum.inductiveautomation.com/t/checksum-mismatch-opening-designer/86992/4 "2024-10-31T18:16:48Z")

</div>

Reviving this thread as I am having a very similar issue.

I am connecting to an Ignition 7.9 gateway over a VPN so I assumed network issues but the network to IP range of the gateway is wide open with no restrictions once I am VPN'ed in. is there anything else it could be?

For reference, this is the error I am getting

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/b/ab77e3c96070cd9e029f58fe545a699147aceb05.png)

I have also considered that it could be firewall/antivirus issues on our end. I have gotten with our IT Team and that doesn't seem to be the case.

---

<div class="post-metadata">

**Author:** ![rudy.vasquez](https://avatars.discourse-cdn.com/v4/letter/r/e8c25b/32.png) [@rudy.vasquez](https://forum.inductiveautomation.com/u/rudy.vasquez)\
**Post date:** [May 27, 2025, 1:29pm UTC](https://forum.inductiveautomation.com/t/checksum-mismatch-opening-designer/86992/5 "2025-05-27T13:29:22Z")

</div>

I had the same error and what worked for me was:

clearing the Java cache:

Control Panel → Java → Settings… under Temporary Internet Files → Delete Files → check Applications and Applets.

Clearing my local cache:

On Windows: open Explorer and go to

%USERPROFILE%.ignition\cache\resources

Delete everything in that folder.