# Error Writing to OPC Address. Access Denied

**URL:** <https://forum.inductiveautomation.com/t/error-writing-to-opc-address-access-denied/14791>\
**Category:** General Discussion\
**Created:** [July 14, 2017, 2:00pm UTC](https://forum.inductiveautomation.com/t/error-writing-to-opc-address-access-denied/14791 "2017-07-14T14:00:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Dseckel](https://avatars.discourse-cdn.com/v4/letter/d/a9a28c/32.png) [@Dseckel](https://forum.inductiveautomation.com/u/Dseckel)\
**Post date:** [July 14, 2017, 2:00pm UTC](https://forum.inductiveautomation.com/t/error-writing-to-opc-address-access-denied/14791/1 "2017-07-14T14:00:44Z")

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I created a project in a development environment and was able to write to tags. I’ve since move the project into a test environment and cannot figure out why I get the error “Error Writing to OPC Address. Access Denied” Has anyone ever run accross this?

Dave

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**Author:** ![Dseckel](https://avatars.discourse-cdn.com/v4/letter/d/a9a28c/32.png) [@Dseckel](https://forum.inductiveautomation.com/u/Dseckel)\
**Post date:** [July 14, 2017, 2:15pm UTC](https://forum.inductiveautomation.com/t/error-writing-to-opc-address-access-denied/14791/2 "2017-07-14T14:15:34Z")

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I just found the error. The opc server was set to Read Only!