# Factory I/O OPC Client DA/UA cannot connect to remote TwinCAT OPC UA server (But locally works)

**URL:** <https://community.factoryio.com/t/factory-i-o-opc-client-da-ua-cannot-connect-to-remote-twincat-opc-ua-server-but-locally-works/4483>\
**Category:** Support\
**Created:** [January 1, 2026, 7:48am UTC](https://community.factoryio.com/t/factory-i-o-opc-client-da-ua-cannot-connect-to-remote-twincat-opc-ua-server-but-locally-works/4483 "2026-01-01T07:48:07Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ahmed-bayoumi93](https://avatars.discourse-cdn.com/v4/letter/a/e274bd/32.png) [@ahmed-bayoumi93](https://community.factoryio.com/u/ahmed-bayoumi93)\
**Post date:** [January 1, 2026, 7:48am UTC](https://community.factoryio.com/t/factory-i-o-opc-client-da-ua-cannot-connect-to-remote-twincat-opc-ua-server-but-locally-works/4483/1 "2026-01-01T07:48:08Z")

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Hello everyone,  
This is my first contribution in the community.

I’m having an issue connecting **Factory I/O** to a **TwinCAT 3 OPC UA server running on another PC / VM**.

Setup

- Factory I/O on PC: `192.168.1.30`

- TwinCAT 3 + OPC UA Server on another PC inside VM: `192.168.1.130`

- Same subnet, VM in **bridged mode**

### TwinCAT OPC UA Server

- Endpoint: `opc.tcp://192.168.1.130:4840`

- Security: None / Anonymous (also with username)

- PLC in RUN, symbols exported

- **OPC UA Sample Client can connect remotely and browse nodes**

### Network tests

- `ping 192.168.1.130` → OK

- `Test-NetConnection 192.168.1.130 -Port 4840` → OK

### Factory I/O behavior

- Using **OPC Client DA/UA**

- Works perfectly when TwinCAT & Factory I/O are on the **same PC**

- Fails when TwinCAT is on another PC/VM

- Server appears as `TcOpcUaServer@DESKTOP… (UA)` but connection/browse fails

### Gateway test

- Beckhoff OPC UA Gateway installed

- Gateway UA endpoint created on port 4850

- Port reachable from Factory I/O PC

- Factory I/O still cannot connect via DA/UA

**Error Message**

Error establishing a connection: 10060 – A connection attempt failed because the connected party did not properly respond after a period of time, or the established connection failed because the connected host has failed to respond.

### Question

Is this a **known limitation** of Factory I/O’s OPC Client DA/UA with **remote OPC UA servers**?  
Is there a recommended way to connect Factory I/O to a **remote TwinCAT OPC UA server**?

Happy to provide full technical details if needed.

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**Author:** ![adriana.silva](https://dub1.discourse-cdn.com/flex017/user_avatar/community.factoryio.com/adriana.silva/32/752_2.png) [@adriana.silva](https://community.factoryio.com/u/adriana.silva)\
**Post date:** [January 9, 2026, 3:14pm UTC](https://community.factoryio.com/t/factory-i-o-opc-client-da-ua-cannot-connect-to-remote-twincat-opc-ua-server-but-locally-works/4483/2 "2026-01-09T15:14:25Z")

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Hello @ahmed-bayoumi93,

First of all, I apologize for taking so long to reply to your post.  
We managed to replicate your issue here. When running both applications on my computer, I managed to connect Factory I/O to the OPC Server. When we tried to connect a different computer to the server running on my computer, it would fail and return the same error you had.  
To solve this, I had to add an exception to the firewall so that the OPC Server was reachable by other computers.

I hope this helps!

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**Author:** ![ahmed-bayoumi93](https://avatars.discourse-cdn.com/v4/letter/a/e274bd/32.png) [@ahmed-bayoumi93](https://community.factoryio.com/u/ahmed-bayoumi93)\
**Post date:** [January 9, 2026, 9:07pm UTC](https://community.factoryio.com/t/factory-i-o-opc-client-da-ua-cannot-connect-to-remote-twincat-opc-ua-server-but-locally-works/4483/3 "2026-01-09T21:07:37Z")

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Hello adriana,  
Thank you for the reply. I guess you mean you added an inbound rule for the listening port in the firewall?  
BR  
Ahmed

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<div class="post-metadata">

**Author:** ![adriana.silva](https://dub1.discourse-cdn.com/flex017/user_avatar/community.factoryio.com/adriana.silva/32/752_2.png) [@adriana.silva](https://community.factoryio.com/u/adriana.silva)\
**Post date:** [January 12, 2026, 8:52am UTC](https://community.factoryio.com/t/factory-i-o-opc-client-da-ua-cannot-connect-to-remote-twincat-opc-ua-server-but-locally-works/4483/4 "2026-01-12T08:52:21Z")

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Hello @ahmed-bayoumi93,

Yes, that’s it. I’m sorry, I wasn’t very clear.