# Issues Upgrading from Ignition 7.9 to 8.1

**URL:** <https://forum.inductiveautomation.com/t/issues-upgrading-from-ignition-7-9-to-8-1/100960>\
**Category:** Ignition\
**Tags:** ignition79, ignition81\
**Created:** [January 16, 2025, 9:30am UTC](https://forum.inductiveautomation.com/t/issues-upgrading-from-ignition-7-9-to-8-1/100960 "2025-01-16T09:30:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Bruno\_Silva](https://avatars.discourse-cdn.com/v4/letter/b/bb73d2/32.png) [@Bruno\_Silva](https://forum.inductiveautomation.com/u/Bruno_Silva)\
**Post date:** [January 16, 2025, 9:30am UTC](https://forum.inductiveautomation.com/t/issues-upgrading-from-ignition-7-9-to-8-1/100960/1 "2025-01-16T09:30:47Z")

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Hi everyone,  
I'm encountering issues while upgrading Ignition from version 7.9 to 8.1.  
Before applying the update in the client environment, I'm testing the process on a dedicated machine.  
Here's what I did:

1. Installed Ignition version 7.9.16.
2. Restored a backup of the 7.9.16 Gateway.
3. Used the Ignition 8.1.45 installer to perform the upgrade.  
The upgrade process seems to complete without errors. However, when I try to access the Gateway after installation, I encounter the following message:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/9/7/975cde5999d5151b6defb597643e0ebef9a5b209.png)

I also noticed that the Ignition service fails to start.  
I’ve checked the `wrapper.log`, but I couldn’t identify the root cause of the problem.  
Has anyone encountered a similar issue or have any advice on how to resolve this?  
Thank you in advance for your help!

Regards,  
Bruno

[wrapper.log](https://forum.inductiveautomation.com/uploads/short-url/6bF5yeuDy9Z8X8a4hBmTgEiudXZ.log) (88.2 KB)

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<div class="post-metadata">

**Author:** ![dkhayes117](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/dkhayes117/32/68344_2.png) [@dkhayes117](https://forum.inductiveautomation.com/u/dkhayes117)\
**Post date:** [January 16, 2025, 1:42pm UTC](https://forum.inductiveautomation.com/t/issues-upgrading-from-ignition-7-9-to-8-1/100960/2 "2025-01-16T13:42:24Z")

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It looks like you have an invalid GC setting in use inside your `ignition.conf` file. Comment it out and try again.

```python
Unrecognized VM option 'UseConcMarkSweepGC'

```