# Mssql-jdbc\_auth-9.4.0.x64.dll removed after every release upgrade

**URL:** <https://forum.inductiveautomation.com/t/mssql-jdbc-auth-9-4-0-x64-dll-removed-after-every-release-upgrade/116931>\
**Category:** Ignition\
**Created:** [August 28, 2026, 8:20am UTC](https://forum.inductiveautomation.com/t/mssql-jdbc-auth-9-4-0-x64-dll-removed-after-every-release-upgrade/116931 "2026-08-28T08:20:09Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Aiasa21](https://avatars.discourse-cdn.com/v4/letter/a/aeb1de/32.png) [@Aiasa21](https://forum.inductiveautomation.com/u/Aiasa21)\
**Post date:** [August 28, 2026, 8:20am UTC](https://forum.inductiveautomation.com/t/mssql-jdbc-auth-9-4-0-x64-dll-removed-after-every-release-upgrade/116931/1 "2026-08-28T08:20:09Z")

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Hi everyone,

Following our migration from Ignition 8.1 to 8.3, I'm facing a recurring issue after every version upgrade.

Due to company security policy, our MSSQL database connections use Windows Authentication via the parameter: `integratedSecurity=true`

The problem occurs with every release upgrade (including the latest update from **8.3.8** to **8.3.9** ): the file `mssql-jdbc_auth-9.4.0.x64.dll` gets automatically removed from the system.

To restore connection functionality, I currently have to perform these steps manually every time:

1. Copy the DLL file to: `C:\Program Files\Inductive Automation\Ignition\lib\core\gateway`

2. Restart the Ignition service.

Am I missing something in the configuration, or is there a proper way to make this library persistent so it doesn't get overwritten or deleted during upgrades?

Thanks in advance for your help!

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**Author:** ![JordanCClark](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jordancclark/32/83362_2.png) [@JordanCClark](https://forum.inductiveautomation.com/u/JordanCClark)\
**Post date:** [August 28, 2026, 12:01pm UTC](https://forum.inductiveautomation.com/t/mssql-jdbc-auth-9-4-0-x64-dll-removed-after-every-release-upgrade/116931/2 "2026-08-28T12:01:10Z")

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Have you tried putting the DLL somewhere else and adding it to the PATH environment variable?

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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:** [August 28, 2026, 12:05pm UTC](https://forum.inductiveautomation.com/t/mssql-jdbc-auth-9-4-0-x64-dll-removed-after-every-release-upgrade/116931/3 "2026-08-28T12:05:34Z")

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Try the `lib` folder instead of `lib/core/gateway`; I think this is also part of `java.library.path` but not wiped out on upgrade.

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**Author:** ![Aiasa21](https://avatars.discourse-cdn.com/v4/letter/a/aeb1de/32.png) [@Aiasa21](https://forum.inductiveautomation.com/u/Aiasa21)\
**Post date:** [August 28, 2026, 12:22pm UTC](https://forum.inductiveautomation.com/t/mssql-jdbc-auth-9-4-0-x64-dll-removed-after-every-release-upgrade/116931/4 "2026-08-28T12:22:38Z")

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To be honest, except for the first time—when I went a bit crazy trying to figure out how to get the DB connections back up—I already knew what to do the other times. As soon as the installation finished, I would just paste them back in (master and backup), so I didn't perform any other tests.

However, I really wanted to find a definitive way to skip this step altogether.

Following your advice, I tested moving the file from `lib/core/gateway` to `lib`; I restarted the Ignition service, and the connections stayed active.

Thanks for the support!