# Client node error OPC UA

**URL:** <https://discourse.nodered.org/t/client-node-error-opc-ua/77239>\
**Category:** General\
**Created:** [4 April 2023 10:59 UTC](https://discourse.nodered.org/t/client-node-error-opc-ua/77239 "2023-04-04T10:59:45Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![marc7600](https://avatars.discourse-cdn.com/v4/letter/m/3d9bf3/32.png) [@marc7600](https://discourse.nodered.org/u/marc7600)\
**Post date:** [4 April 2023 10:59 UTC](https://discourse.nodered.org/t/client-node-error-opc-ua/77239/1 "2023-04-04T10:59:45Z")

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Hello,

i'm using node-red with the contrib-opcua module. sometimes my node says the following error:

```auto
e[31mClient node error on: error: ["Cannot create client, check connection options: [{\"securityPolicy\":\"1\",\"securityMode\":1,\"clientCertificateManager\":\"2\",\"requestedSessionTimeout\":300000,\"clientName\":\"3\",\"endpointMustExist\":false,\"defaultSecureTokenLifetime\":200000,\"connectionStrategy\":\"4\",\"keepSessionAlive\":true},\"http://opcfoundation.org/UA/SecurityPolicy#None\",{\"untrustUnknownCertificate\":true,\"state\":2,\"folderPoolingInterval\":5000,\"_watchers\":\"5\",\"_readCertificatesCalled\":true,\"_filenameToHash\":\"6\",\"_thumbs\":\"7\",\"_pending_crl_to_process\":0,\"queue\":\"8\",\"location\":\"9\",\"keySize\":2048,\"referenceCounter\":0,\"automaticallyAcceptUnknownCertificate\":true},\"\",{\"maxRetry\":10512000,\"initialDelay\":5000,\"maxDelay\":30000},[\"10\",\"11\",\"12\",\"13\",\"14\"],{\"/root/.config/node-red-opcua-nodejs/PKI/trusted/certs/NodeOPCUA-Client@kali-1d-fc25-01[b437dc63fc54ecf7302a5bef99ab58df724eae6e].pem\":\"15\"},{\"rejected\":\"16\",\...

```

what can i do?

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<div class="post-metadata">

**Author:** ![mikakaraila](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mikakaraila/32/37496_2.png) [@mikakaraila](https://discourse.nodered.org/u/mikakaraila)\
**Post date:** [26 April 2023 19:04 UTC](https://discourse.nodered.org/t/client-node-error-opc-ua/77239/2 "2023-04-26T19:04:26Z")

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Most probably openssl is missing. node-opcua tries to install it.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [25 June 2023 19:05 UTC](https://discourse.nodered.org/t/client-node-error-opc-ua/77239/3 "2023-06-25T19:05:02Z")

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