# Unable to connect to Kaiser-Raman OPC UA server using opc ua node

**URL:** <https://discourse.nodered.org/t/unable-to-connect-to-kaiser-raman-opc-ua-server-using-opc-ua-node/32713>\
**Category:** General\
**Created:** [10 September 2020 19:59 UTC](https://discourse.nodered.org/t/unable-to-connect-to-kaiser-raman-opc-ua-server-using-opc-ua-node/32713 "2020-09-10T19:59:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Shakti060](https://avatars.discourse-cdn.com/v4/letter/s/a9adbd/32.png) [@Shakti060](https://discourse.nodered.org/u/Shakti060)\
**Post date:** [10 September 2020 19:59 UTC](https://discourse.nodered.org/t/unable-to-connect-to-kaiser-raman-opc-ua-server-using-opc-ua-node/32713/1 "2020-09-10T19:59:15Z")

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Hi, I am trying to connect to an OPCUA-server using Basic256/Basic128Rsa15 security policy using Node-Red's inbuilt certificates and key. My flow works perfectly fine when working on a simulation server I've created using Node-JS SDK.

I'm receiving the following error code with inbuilt credentials.

- Error : client1 Security token has expired : tokenId 1

I replaced the certificate and key after going through this thread - S7-1500 secure conversation is closed with simple\_client.js #549 ([node-opcua/node-opcua#549](https://github.com/node-opcua/node-opcua/issues/549))  
And am getting the following error...

- Error : internal error expecting valid derivedKeys

Can someone suggest something to get this to work?

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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:** [9 November 2020 19:59 UTC](https://discourse.nodered.org/t/unable-to-connect-to-kaiser-raman-opc-ua-server-using-opc-ua-node/32713/2 "2020-11-09T19:59:32Z")

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