# Can i use other way to connect ignition's OPC UA server? **URL:** \ **Category:** Ignition\ **Tags:** ignition79\ **Created:** [July 5, 2022, 10:13pm UTC](https://forum.inductiveautomation.com/t/can-i-use-other-way-to-connect-ignitions-opc-ua-server/61541 "2022-07-05T22:13:54Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![wangjun\_ming\_1996](https://avatars.discourse-cdn.com/v4/letter/w/ee59a6/32.png) [@wangjun\_ming\_1996](https://forum.inductiveautomation.com/u/wangjun_ming_1996)\ **Post date:** [July 5, 2022, 10:13pm UTC](https://forum.inductiveautomation.com/t/can-i-use-other-way-to-connect-ignitions-opc-ua-server/61541/1 "2022-07-05T22:13:54Z")
I want to use other way to Develop application,not use Igniton to create project But I alse need to read PLC tags. Can i use other way like using python/c#/java to connect Ignition’s OPC UA server to read / write PLC tags? If it can be completed what steps i need to do? Thanks ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [July 5, 2022, 10:46pm UTC](https://forum.inductiveautomation.com/t/can-i-use-other-way-to-connect-ignitions-opc-ua-server/61541/2 "2022-07-05T22:46:59Z")
An Ignition server can be just the OPC/UA module and the drivers you need. So, yes. And it happens that the cheapest license (base platform) includes the OPC/UA module and the most popular drivers. By default, though, the OPC/UA server in Ignition is only listening to localhost. You’ll have to change that to a specific IP address, or to the `0.0.0.0` wildcard address. You also want to supplement the list of allowed users in the OPC user source. For each client that connects securely (highly recommended), you’ll need to approve their certificate. ---
**Author:** ![wangjun\_ming\_1996](https://avatars.discourse-cdn.com/v4/letter/w/ee59a6/32.png) [@wangjun\_ming\_1996](https://forum.inductiveautomation.com/u/wangjun_ming_1996)\ **Post date:** [July 6, 2022, 12:37am UTC](https://forum.inductiveautomation.com/t/can-i-use-other-way-to-connect-ignitions-opc-ua-server/61541/3 "2022-07-06T00:37:09Z")
We have Ignition license . Can you tell me how to set the IP to change the way for listening. ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [July 6, 2022, 12:39am UTC](https://forum.inductiveautomation.com/t/can-i-use-other-way-to-connect-ignitions-opc-ua-server/61541/4 "2022-07-06T00:39:00Z")
Start here: [https://docs.inductiveautomation.com/display/DOC81/Ignition's+OPC+UA+Server](https://docs.inductiveautomation.com/display/DOC81/Ignition%27s+OPC+UA+Server) ---
**Author:** ![wangjun\_ming\_1996](https://avatars.discourse-cdn.com/v4/letter/w/ee59a6/32.png) [@wangjun\_ming\_1996](https://forum.inductiveautomation.com/u/wangjun_ming_1996)\ **Post date:** [July 6, 2022, 12:40am UTC](https://forum.inductiveautomation.com/t/can-i-use-other-way-to-connect-ignitions-opc-ua-server/61541/5 "2022-07-06T00:40:52Z")
Thanks a lot ---
**Author:** ![wangjun\_ming\_1996](https://avatars.discourse-cdn.com/v4/letter/w/ee59a6/32.png) [@wangjun\_ming\_1996](https://forum.inductiveautomation.com/u/wangjun_ming_1996)\ **Post date:** [July 8, 2022, 2:06am UTC](https://forum.inductiveautomation.com/t/can-i-use-other-way-to-connect-ignitions-opc-ua-server/61541/6 "2022-07-08T02:06:54Z")
HI @pturmel I got a certificate ‘ ignition-client.der’ .But the private key where i can get ? Files with the pem suffix ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/0/8/081b4dd90b289d449138b923a0374aea6e37c2cc.png) ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [July 8, 2022, 2:13am UTC](https://forum.inductiveautomation.com/t/can-i-use-other-way-to-connect-ignitions-opc-ua-server/61541/7 "2022-07-08T02:13:04Z")
I would expect you to make a private key for your client software. As a prerequisite for making a certificate for your client. OpenSSL can convert DER and PEM formats back and forth. It can also do key and cert generation. ---
**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:** [July 8, 2022, 2:17am UTC](https://forum.inductiveautomation.com/t/can-i-use-other-way-to-connect-ignitions-opc-ua-server/61541/8 "2022-07-08T02:17:07Z")
You seem to be making the same mistake as this post: [Failed to connect Ignition OPC-UA server using Sign And Encrypt mechanism via Python OPC-UA client - #7 by Hari\_GB](https://forum.inductiveautomation.com/t/failed-to-connect-ignition-opc-ua-server-using-sign-and-encrypt-mechanism-via-python-opc-ua-client/16865/7) ---
**Author:** ![wangjun\_ming\_1996](https://avatars.discourse-cdn.com/v4/letter/w/ee59a6/32.png) [@wangjun\_ming\_1996](https://forum.inductiveautomation.com/u/wangjun_ming_1996)\ **Post date:** [July 8, 2022, 2:29am UTC](https://forum.inductiveautomation.com/t/can-i-use-other-way-to-connect-ignitions-opc-ua-server/61541/9 "2022-07-08T02:29:25Z")
thanks 😃 ---
**Author:** ![wangjun\_ming\_1996](https://avatars.discourse-cdn.com/v4/letter/w/ee59a6/32.png) [@wangjun\_ming\_1996](https://forum.inductiveautomation.com/u/wangjun_ming_1996)\ **Post date:** [July 8, 2022, 2:30am UTC](https://forum.inductiveautomation.com/t/can-i-use-other-way-to-connect-ignitions-opc-ua-server/61541/10 "2022-07-08T02:30:50Z")
Fantastic 👏