# Error Accessing license server

**URL:** <https://community.factoryio.com/t/error-accessing-license-server/2665>\
**Category:** Licenses\
**Created:** [January 19, 2024, 8:01pm UTC](https://community.factoryio.com/t/error-accessing-license-server/2665 "2024-01-19T20:01:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![alejandro.restituyo](https://avatars.discourse-cdn.com/v4/letter/a/278dde/32.png) [@alejandro.restituyo](https://community.factoryio.com/u/alejandro.restituyo)\
**Post date:** [January 19, 2024, 8:01pm UTC](https://community.factoryio.com/t/error-accessing-license-server/2665/1 "2024-01-19T20:01:02Z")

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I’m trying to activate a siemens license I recently bought, but I keep getting the following error:

Error Accessing license server. Error: TrustFailure (Authentication failed, see inner exception).

I’m trying to do this on a VMWare VM where we have all our siemens software, also all our internet access at work is trough Zscaler.

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**Author:** ![brunovgr](https://dub1.discourse-cdn.com/flex017/user_avatar/community.factoryio.com/brunovgr/32/12_2.png) [@brunovgr](https://community.factoryio.com/u/brunovgr)\
**Post date:** [January 22, 2024, 10:05am UTC](https://community.factoryio.com/t/error-accessing-license-server/2665/2 "2024-01-22T10:05:17Z")

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I suspect that something is blocking Factory I/O from reaching the license server. We have used VMWare VM without any issues. However, I’m not familiar with Zscaler. I would recommend that you contact support (support [at] realgames.pt) in order to get assistance.

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**Author:** ![alejandro.restituyo](https://avatars.discourse-cdn.com/v4/letter/a/278dde/32.png) [@alejandro.restituyo](https://community.factoryio.com/u/alejandro.restituyo)\
**Post date:** [January 22, 2024, 7:07pm UTC](https://community.factoryio.com/t/error-accessing-license-server/2665/3 "2024-01-22T19:07:01Z")

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Thanks, I will try that.