# OPC DA Value Null

**URL:** <https://forum.inductiveautomation.com/t/opc-da-value-null/29574>\
**Category:** Ignition\
**Created:** [October 31, 2019, 5:41pm UTC](https://forum.inductiveautomation.com/t/opc-da-value-null/29574 "2019-10-31T17:41:06Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![tamerplc](https://avatars.discourse-cdn.com/v4/letter/t/d78d45/32.png) [@tamerplc](https://forum.inductiveautomation.com/u/tamerplc)\
**Post date:** [October 31, 2019, 5:41pm UTC](https://forum.inductiveautomation.com/t/opc-da-value-null/29574/1 "2019-10-31T17:41:06Z")

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I just installed ignition v8 in new server. i am able to brows opc tags but no value appeared . while i run OPC EXPERT tools in same gateway machine and able to browse and read the OPC tags .

![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/c/cd920751a1ad5f8362f32e1e22fdbfd14997250a.png)

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**Author:** ![tamerplc](https://avatars.discourse-cdn.com/v4/letter/t/d78d45/32.png) [@tamerplc](https://forum.inductiveautomation.com/u/tamerplc)\
**Post date:** [November 5, 2019, 9:28pm UTC](https://forum.inductiveautomation.com/t/opc-da-value-null/29574/2 "2019-11-05T21:28:11Z")

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issue solved by changing the default setting in component services as per below 🙂  
[https://docs.inductiveautomation.com/display/DOC79/OPC+COM](https://docs.inductiveautomation.com/display/DOC79/OPC+COM)

1. Open the **Windows Component Services** , located in the **Administrative Tools** section of the **Control Panel**.

2. Browse down through the **Component Services** tree until you see **My Computer** , right-click and select **Properties**.

3. We want to focus on the COM Security tab. There are two sections, **Access Permissions and Launch** and **Activation Permissions**. Each section has an **Edit Limits…** and **Edit**** Defaults… **button. You must add the ANONYMOUS and Everyone accounts under each of the four areas making sure that the** Allow** option is checked for each of the permission settings. If you skip adding both of these to either the limits or defaults areas under either of the two sections there is a good chance your connection will not be successful.

4. You can also try setting the **Default Authentication Level** to **None** and the **Default Impersonation Level** to **Identify** on the Default Properties tab. This isn’t always necessary but it can sometimes help.

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**Author:** ![Anderson\_Suarez](https://avatars.discourse-cdn.com/v4/letter/a/71e660/32.png) [@Anderson\_Suarez](https://forum.inductiveautomation.com/u/Anderson_Suarez)\
**Post date:** [January 31, 2024, 8:32pm UTC](https://forum.inductiveautomation.com/t/opc-da-value-null/29574/3 "2024-01-31T20:32:42Z")

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For posterity, if this was not enough to solve your issue try running Ignition as a different user.

Go on Services, Ignition, Properties, Log On to change the user. This worked for me.