# '2147942405 - Unknown error' using node opc-da-in

**URL:** <https://discourse.nodered.org/t/2147942405-unknown-error-using-node-opc-da-in/58602>\
**Category:** General\
**Created:** [18 February 2022 14:22 UTC](https://discourse.nodered.org/t/2147942405-unknown-error-using-node-opc-da-in/58602 "2022-02-18T14:22:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Laura1](https://avatars.discourse-cdn.com/v4/letter/l/47e85d/32.png) [@Laura1](https://discourse.nodered.org/u/Laura1)\
**Post date:** [18 February 2022 14:22 UTC](https://discourse.nodered.org/t/2147942405-unknown-error-using-node-opc-da-in/58602/1 "2022-02-18T14:22:08Z")

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I'm trying to connect to OPC DA Server and I'm receiving the screenshot error.

![node_error](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/c/7/c7a1b0ebfc045a00207e0a5cdc8e4eb3691766b2.png)

This OPC connection has been working fine for several months now and suddenly has stopped.  
I read this error is due to DCOM settings. I tried different configurations but without success

Has anyone else had this error and solved it?

Thank you in advance

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [19 April 2022 14:22 UTC](https://discourse.nodered.org/t/2147942405-unknown-error-using-node-opc-da-in/58602/2 "2022-04-19T14:22:10Z")

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