# OPC Client DA/UA can't connect to server

**URL:** <https://community.factoryio.com/t/opc-client-da-ua-cant-connect-to-server/508>\
**Category:** Drivers\
**Created:** [October 22, 2020, 9:16am UTC](https://community.factoryio.com/t/opc-client-da-ua-cant-connect-to-server/508 "2020-10-22T09:16:43Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![mommeja](https://avatars.discourse-cdn.com/v4/letter/m/eb9ed0/32.png) [@mommeja](https://community.factoryio.com/u/mommeja)\
**Post date:** [October 23, 2020, 5:58pm UTC](https://community.factoryio.com/t/opc-client-da-ua-cant-connect-to-server/508/3 "2020-10-23T17:58:12Z")

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Bruno, thanks for your reply.

- Yes I am using 2.4.3
- I am using the node-opcua OPC server. More specifically the sample that was provided in this forum [https://community.factoryio.com/t/node-opcua-server/332/8](https://community.factoryio.com/t/node-opcua-server/332/8)  
In this sample, the server is instantiated this way, I guess there is no security at all. I don’t see what I should change, to allow the Factory I/O client to connect. Thanks for your guidance.  
const server = new opcua.OPCUAServer({  
port: 4334, // the port of the listening socket of the server  
resourcePath: “/UA/MyLittleServer”, // this path will be added to the endpoint resource name  
buildInfo : {  
productName: “MySampleServer1”,  
buildNumber: “7658”,  
buildDate: new Date(2014,5,2)  
}  
});

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