# Error to connect PLC KV8000 OPC UA

**URL:** <https://forum.inductiveautomation.com/t/error-to-connect-plc-kv8000-opc-ua/114340>\
**Category:** General Discussion\
**Created:** [March 5, 2026, 3:38pm UTC](https://forum.inductiveautomation.com/t/error-to-connect-plc-kv8000-opc-ua/114340 "2026-03-05T15:38:52Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jromero2](https://avatars.discourse-cdn.com/v4/letter/j/47e85d/32.png) [@jromero2](https://forum.inductiveautomation.com/u/jromero2)\
**Post date:** [March 5, 2026, 3:38pm UTC](https://forum.inductiveautomation.com/t/error-to-connect-plc-kv8000-opc-ua/114340/1 "2026-03-05T15:38:52Z")

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Hello everyone,

I tried to connect my Keyence PLC model KV8000 in the way mentioned in the following link [Connecting Ignition to Keyence PLCs using OPC-UA | Corso Systems](https://corsosystems.com/posts/connecting-ignition-to-keyence-plcs-using-opc-ua) , but I get this error.

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/2/320cfdc32b4c4085f3a2423dcd35babc99aa9c7c.png)

Does anyone know if I need to have my port 4840 open, or if there is another firewall configuration I need to set up, or if the problem is something else?

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/1/1/11a7fa6e70368897bcc5e5d2a8eb8e9f0dc83ef7.png)

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/1/a16f0cae5f040a528ce740cac34c10fd12669a8f.png)

Thanks.