# Issues reading tags from AB EN4TR - Connects but tags Uncertain\_LastKnownValue quality

**URL:** <https://forum.inductiveautomation.com/t/issues-reading-tags-from-ab-en4tr-connects-but-tags-uncertain-lastknownvalue-quality/55691>\
**Category:** Ignition\
**Created:** [February 2, 2022, 11:10pm UTC](https://forum.inductiveautomation.com/t/issues-reading-tags-from-ab-en4tr-connects-but-tags-uncertain-lastknownvalue-quality/55691 "2022-02-02T23:10:20Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [February 2, 2022, 11:10pm UTC](https://forum.inductiveautomation.com/t/issues-reading-tags-from-ab-en4tr-connects-but-tags-uncertain-lastknownvalue-quality/55691/1 "2022-02-02T23:10:20Z")

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I’m testing comms to an L83 via an AB EN4TR however I’m unable to get it reading tags. It connects fine but tags are coming up with:  
[2, Uncertain\_LastKnownValue(“Whatever was updating this value has stopped doing so.”), Thu Feb 03 09:37:20 ACDT 2022 (1643843240797)]

Swapping back to talking via the onboard L83 ethernet works fine.

Any ideas? What loggers should I be turning on?

This is what I see in the OPC browser, no tags showing up:  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/5/6/56a60b774ab17640d13ce0614e848b2b84295f01.png)

and their values:  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/2/0/202c69e6abbc9568bbff9ef92bb9f0378b5cab21.png)

Edit:  
I noticed this in logs:

```auto
com.digitalpetri.enip.cip.CipResponseException: status=0x01 [connection failure] , additional=[0x032F]

at com.digitalpetri.enip.cip.services.GetAttributeListService.decodeResponse(GetAttributeListService.java:45)

at com.digitalpetri.enip.cip.services.GetAttributeListService.decodeResponse(GetAttributeListService.java:12)

at com.digitalpetri.enip.cip.services.UnconnectedSendService.decodeResponse(UnconnectedSendService.java:122)

at com.digitalpetri.enip.cip.CipClient.lambda$invoke$2(CipClient.java:124)

at java.base/java.util.concurrent.CompletableFuture.uniWhenComplete(Unknown Source)

at java.base/java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(Unknown Source)

at java.base/java.util.concurrent.CompletableFuture.postComplete(Unknown Source)

at java.base/java.util.concurrent.CompletableFuture.complete(Unknown Source)

at com.digitalpetri.enip.cip.CipClient.lambda$sendUnconnectedData$8(CipClient.java:222)

at java.base/java.util.concurrent.CompletableFuture.uniWhenComplete(Unknown Source)

at java.base/java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(Unknown Source)

at java.base/java.util.concurrent.CompletableFuture.postComplete(Unknown Source)

at java.base/java.util.concurrent.CompletableFuture.complete(Unknown Source)

at com.digitalpetri.enip.EtherNetIpClient$PendingRequest.lambda$new$0(EtherNetIpClient.java:412)

at java.base/java.util.concurrent.CompletableFuture.uniWhenComplete(Unknown Source)

at java.base/java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(Unknown Source)

at java.base/java.util.concurrent.CompletableFuture.postComplete(Unknown Source)

at java.base/java.util.concurrent.CompletableFuture.complete(Unknown Source)

at com.digitalpetri.enip.EtherNetIpClient.onChannelRead(EtherNetIpClient.java:220)

at com.digitalpetri.enip.EtherNetIpClient.access$900(EtherNetIpClient.java:50)

at com.digitalpetri.enip.EtherNetIpClient$EtherNetIpClientHandler.lambda$channelRead0$0(EtherNetIpClient.java:346)

at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at java.base/java.lang.Thread.run(Unknown Source)

```

What can cause the CIP connection to fail?

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<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:** [February 2, 2022, 11:20pm UTC](https://forum.inductiveautomation.com/t/issues-reading-tags-from-ab-en4tr-connects-but-tags-uncertain-lastknownvalue-quality/55691/2 "2022-02-02T23:20:23Z")

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Womp womp. That additional error code falls into the “vendor specific” range of 0x0320-  
0x07FF.

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<div class="post-metadata">

**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [February 2, 2022, 11:20pm UTC](https://forum.inductiveautomation.com/t/issues-reading-tags-from-ab-en4tr-connects-but-tags-uncertain-lastknownvalue-quality/55691/3 "2022-02-02T23:20:56Z")

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The “good luck, son!” range ☹ I’ll get in touch with RA, cheers

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<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:** [February 2, 2022, 11:22pm UTC](https://forum.inductiveautomation.com/t/issues-reading-tags-from-ab-en4tr-connects-but-tags-uncertain-lastknownvalue-quality/55691/4 "2022-02-02T23:22:02Z")

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I think maybe something to do with CIP security or firewall/whitelist or something?

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<div class="post-metadata">

**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [February 2, 2022, 11:22pm UTC](https://forum.inductiveautomation.com/t/issues-reading-tags-from-ab-en4tr-connects-but-tags-uncertain-lastknownvalue-quality/55691/5 "2022-02-02T23:22:41Z")

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Ooo, i’ll\* have a look, thanks

\*I’ll get my PLC mate to have a look

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<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:** [February 2, 2022, 11:23pm UTC](https://forum.inductiveautomation.com/t/issues-reading-tags-from-ab-en4tr-connects-but-tags-uncertain-lastknownvalue-quality/55691/6 "2022-02-02T23:23:47Z")

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There’s a reference to 0x032F in [this doc](https://literature.rockwellautomation.com/idc/groups/literature/documents/td/enet-td022_-en-p.pdf) as being “0x032F: Ingress rule deny non-secure.”.