# Sierra LX40 acknowledgements not working

**URL:** <https://forum.inductiveautomation.com/t/sierra-lx40-acknowledgements-not-working/74933>\
**Category:** Ignition\
**Created:** [June 12, 2023, 10:53pm UTC](https://forum.inductiveautomation.com/t/sierra-lx40-acknowledgements-not-working/74933 "2023-06-12T22:53:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Bigtalljv](https://avatars.discourse-cdn.com/v4/letter/b/e19adc/32.png) [@Bigtalljv](https://forum.inductiveautomation.com/u/Bigtalljv)\
**Post date:** [June 12, 2023, 10:53pm UTC](https://forum.inductiveautomation.com/t/sierra-lx40-acknowledgements-not-working/74933/1 "2023-06-12T22:53:17Z")

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hi,

I set up a Sierra LX40 for sms alerts today and it's working to send them out but the acknowledgement responses aren't working. The inbound SMS shows up in the LX40 management page, I see my phone number and the 6 digit code I sent, but the alarm never acknowledges. There doesn't seem to be that much setup, I have the "two-way" box checked in the notification profile. I have the IP address of my server in the LX40 setup but I am running redundant servers, I am pointing to the active one.

Any idea what I should check next?

Thanks,

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<div class="post-metadata">

**Author:** ![Bigtalljv](https://avatars.discourse-cdn.com/v4/letter/b/e19adc/32.png) [@Bigtalljv](https://forum.inductiveautomation.com/u/Bigtalljv)\
**Post date:** [June 13, 2023, 5:28pm UTC](https://forum.inductiveautomation.com/t/sierra-lx40-acknowledgements-not-working/74933/2 "2023-06-13T17:28:10Z")

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well, it was the Microsoft firewall on the server blocking the return messages. Added a rules to open the port and it's working. 😬