# \[IGN-13789\] \[null, Bad\_NotConnected("Communication with the data source is defined, but not established, and there is no last known value available."),

**URL:** <https://forum.inductiveautomation.com/t/ign-13789-null-bad-notconnected-communication-with-the-data-source-is-defined-but-not-established-and-there-is-no-last-known-value-available/109125>\
**Category:** Ignition 8.3 Early Access\
**Created:** [July 30, 2025, 7:33am UTC](https://forum.inductiveautomation.com/t/ign-13789-null-bad-notconnected-communication-with-the-data-source-is-defined-but-not-established-and-there-is-no-last-known-value-available/109125 "2025-07-30T07:33:09Z")\
**Posts on this page:** 1\
**Showing post:** 12

<div class="post-metadata">

**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:** [November 10, 2025, 5:05pm UTC](https://forum.inductiveautomation.com/t/ign-13789-null-bad-notconnected-communication-with-the-data-source-is-defined-but-not-established-and-there-is-no-last-known-value-available/109125/12 "2025-11-10T17:05:07Z")

</div>

Could be this: [Siemens Symbolic disconnect after adding certain tags - #4 by Cody\_Morgan](https://forum.inductiveautomation.com/t/siemens-symbolic-disconnect-after-adding-certain-tags/110710/4)

---

_[View the full topic](https://forum.inductiveautomation.com/t/ign-13789-null-bad-notconnected-communication-with-the-data-source-is-defined-but-not-established-and-there-is-no-last-known-value-available/109125)._