# Opcda-red error: Unexpexted PDU from server

**URL:** <https://discourse.nodered.org/t/opcda-red-error-unexpexted-pdu-from-server/54034>\
**Category:** Industrial\
**Created:** [20 November 2021 16:04 UTC](https://discourse.nodered.org/t/opcda-red-error-unexpexted-pdu-from-server/54034 "2021-11-20T16:04:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![saalty](https://avatars.discourse-cdn.com/v4/letter/s/8c91f0/32.png) [@saalty](https://discourse.nodered.org/u/saalty)\
**Post date:** [20 November 2021 16:04 UTC](https://discourse.nodered.org/t/opcda-red-error-unexpexted-pdu-from-server/54034/1 "2021-11-20T16:04:32Z")

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Hello all!

I have error with reading data from OPC DA server. I use **opcda-read** node for this purpose. Node-Red is running on the Windows 10 system, OPC DA server on other Windows XP machine. Connection estabilished, reading data worked well (Status: Connecting --\> Ready --\> Good Suality (after reading the data)) but after a while I got an error message mentioned in title. I can't recognise the source of the issue. What solve this issue is only restart server side pc (I mean restarting the Windows). Tried to restart client side Node-Red, redeploy or reboot the whole Windows 10, but nothing solved. If error occurs then I cannot read data normally with other software (OPC Scout) on the client pc normally anymore. Screenshot from the Command Promt.

![Picture](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/c/a/ca65b4c5f3a23a18649ecb777b55fd1f58add51a.jpeg)

Important is that the connection and the data transfer was good, and after a while with unknown reason this error happens. Can anybody help me to solve this issue?

greetings,

saalty

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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 January 2022 16:05 UTC](https://discourse.nodered.org/t/opcda-red-error-unexpexted-pdu-from-server/54034/2 "2022-01-19T16:05:00Z")

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