Article - CS309926
Some tags from target OPC UA Server show BAD quality and error code 0X80340000 BadNodeIdUnknown in KEPServerEX /ThingWorx Kepware Server
Modified: 10-Feb-2026
Applies To
- Kepware Server (formerly KEPServerEX) 5.20.396.0 to 7.0
- ThingWorx Kepware Server (legacy) 8.4 to 6.18
- Driver: OPC UA Client
Description
- Some tags from target OPC UA Server show BAD quality in KEPServerEX /ThingWorx Kepware Server (KSE/TKS)
- OPC UA Device Settings > Subscription > Update Mode = Exception
- Error in event log:
Error OPC UA Client Channel.Device | Add item failed on device. | Tag address = 'ns=2;s=[address]', Status description = 'The node id refers to a node that does not exist in the server address space.', Status code = 0X80340000.
- OPC traces show error BadNodeIdUnknown
- Procedure of resolution "Status code = 0X80340000." in Kepware
- We have a OPC UA client installed on the a server to connect at the Siemens PCS7 DCS and sometime especially when the operator change tags or configuration on the DCS Siemens the connection of somes tags freeze and the Quality drops to 0 (0x0000) until a new client has disconnect and reconnect, Do you know if a setting I can set to restart automatically ?
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