# Cannot access OPCUA server from an external device on the same network

**URL:** <https://forum.inductiveautomation.com/t/cannot-access-opcua-server-from-an-external-device-on-the-same-network/98489>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [November 11, 2024, 9:53pm UTC](https://forum.inductiveautomation.com/t/cannot-access-opcua-server-from-an-external-device-on-the-same-network/98489 "2024-11-11T21:53:23Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![face\_plant](https://avatars.discourse-cdn.com/v4/letter/f/e495f1/32.png) [@face\_plant](https://forum.inductiveautomation.com/u/face_plant)\
**Post date:** [November 11, 2024, 9:53pm UTC](https://forum.inductiveautomation.com/t/cannot-access-opcua-server-from-an-external-device-on-the-same-network/98489/1 "2024-11-11T21:53:23Z")

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Hello! I am trying to connect to the ignition edge OPCUA server running on my PLC from a process running in a docker container on a different computer within the same network.

However, the process within the docker container cannot connect to the OPCUA server running on the PLC.

I have even tried connecting to it from my laptop using a opcua client and that can't connect to it either.

My OPCUA Server settings are below:

- `bind port`: 62541
- `bind address`: 0.0.0.0
- `Endpoint Addresses`: `<hostname>,<localhost>`
- `Security Policies`: None,Basic256Sha256
- `Anonymous Access Allowed`: true
- `Expose Tag Providers`: true

I found [this post](https://forum.inductiveautomation.com/t/endpoint-configuration-in-ignition-8/28628) so I set my `Endpoint Addresses` to `<hostname>,<localhost>,the.PLCs.ip.addr` and `Security Policies` to `None,Basic256Sha256,None` since the container tries to reach the OPCUA server using the URL `opc.tcp://the.PLCs.IP.addr:62541` and still got the same error.

It's like the OPCUA server is never being binded to `0.0.0.0` since even nmap can't find it.

Also, [given this post](https://forum.inductiveautomation.com/t/where-to-find-the-modl-file-for-the-iiot-module/96443/4), I have also made sure that the IIOT plugin is installed AND the MQTT transmittion module.

I have a docker compose setup where accessing the ignition instance is fine with my original settings.

My ignition edge version is 8.1.21

If theres any info I can provide to help, please let me know. Thank you!!!

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<div class="post-metadata">

**Author:** ![michael.flagler](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/michael.flagler/32/26272_2.png) [@michael.flagler](https://forum.inductiveautomation.com/u/michael.flagler)\
**Post date:** [November 11, 2024, 10:06pm UTC](https://forum.inductiveautomation.com/t/cannot-access-opcua-server-from-an-external-device-on-the-same-network/98489/2 "2024-11-11T22:06:22Z")

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Since you're mentioning v8.1.21, I want to make sure you also have a license for the IIoT module. Newer licenses this is all packaged together, but if you don't have the license it probably won't work. I would check any firewalls on the PC to make sure port 62541 is open and not being blocked.

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<div class="post-metadata">

**Author:** ![face\_plant](https://avatars.discourse-cdn.com/v4/letter/f/e495f1/32.png) [@face\_plant](https://forum.inductiveautomation.com/u/face_plant)\
**Post date:** [November 12, 2024, 1:59pm UTC](https://forum.inductiveautomation.com/t/cannot-access-opcua-server-from-an-external-device-on-the-same-network/98489/3 "2024-11-12T13:59:01Z")

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You were right about the firewall. Since I have a Opto22 GROOV EPIC, I had to add a firewall rule in groov manage to allow access TCP access to port 62541. I could set `Bind Address` to `0.0.0.0` and `Endpoint Addresses` to `<hostname>,<localhost>` and it worked. Thank you!!!