# Connecting from Ignition on Linux to OPC DA server

**URL:** <https://forum.inductiveautomation.com/t/connecting-from-ignition-on-linux-to-opc-da-server/6637>\
**Category:** Ignition\
**Created:** [June 4, 2013, 9:41am UTC](https://forum.inductiveautomation.com/t/connecting-from-ignition-on-linux-to-opc-da-server/6637 "2013-06-04T09:41:54Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Viggi](https://avatars.discourse-cdn.com/v4/letter/v/ce7236/32.png) [@Viggi](https://forum.inductiveautomation.com/u/Viggi)\
**Post date:** [June 4, 2013, 9:41am UTC](https://forum.inductiveautomation.com/t/connecting-from-ignition-on-linux-to-opc-da-server/6637/1 "2013-06-04T09:41:54Z")

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Hi!  
I really need to connect to an OPC DA server on windows from Ignition on Linux.  
Is it possible…?

Looking forward to a solution.

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**Author:** ![Dravik](https://avatars.discourse-cdn.com/v4/letter/d/e274bd/32.png) [@Dravik](https://forum.inductiveautomation.com/u/Dravik)\
**Post date:** [June 4, 2013, 1:00pm UTC](https://forum.inductiveautomation.com/t/connecting-from-ignition-on-linux-to-opc-da-server/6637/2 "2013-06-04T13:00:14Z")

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OPC DA requires COM. Linux doesn’t do COM.  
I believe you’ll need a wrapper to expose your OPC-DA server as a UA one.

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**Author:** ![Viggi](https://avatars.discourse-cdn.com/v4/letter/v/ce7236/32.png) [@Viggi](https://forum.inductiveautomation.com/u/Viggi)\
**Post date:** [June 13, 2013, 9:40am UTC](https://forum.inductiveautomation.com/t/connecting-from-ignition-on-linux-to-opc-da-server/6637/3 "2013-06-13T09:40:40Z")

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I tried the Matrikon OPC UA wrapper. I was able to connect using Ignition OPC UA client on Windows, but i was unable to connect from OPC UA client on Linux. ❓  
I get an error : Internal UA Exception:java.net.UnknownHostException:pc1…etc

Are there OS settings that i need to carry out in order to connect from Ignition UA client on Linux ???

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [June 13, 2013, 2:12pm UTC](https://forum.inductiveautomation.com/t/connecting-from-ignition-on-linux-to-opc-da-server/6637/4 "2013-06-13T14:12:15Z")

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It looks like Matrikon is returning ‘pc1’ in the endpoint address, which your linux server can’t resolve. Two options:

1. Use the ‘Host Override’ (advanced) setting on Ignition’s UA connection to Matrikon and put the Matrikon server’s IP address.
2. Add pc1 to /etc/hosts (resolving to the Matrikon server’s IP address).

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<div class="post-metadata">

**Author:** ![Viggi](https://avatars.discourse-cdn.com/v4/letter/v/ce7236/32.png) [@Viggi](https://forum.inductiveautomation.com/u/Viggi)\
**Post date:** [June 14, 2013, 1:44pm UTC](https://forum.inductiveautomation.com/t/connecting-from-ignition-on-linux-to-opc-da-server/6637/5 "2013-06-14T13:44:31Z")

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I tried option 1.  
It worked.  
thanks…🙂