Article - CS294079
Troubleshooting tips for OPC DA Client driver connectivity in PTC Kepware Products
Modified: 30-Sep-2025
Applies To
- ThingWorx Kepware Server (legacy) 8.0 to 6.18
- Kepware Server (formerly KEPServerEX) 5.1.71.0 to 6.18
- ThingWorx Platform 9.3 to 9.4
- Driver: OPC DA Client
Description
- Troubleshootings tips for OPC DA Client driver connectivity in KEPServerEX / ThingWorx Industrial Connectivity (KSE/TWIC)
- Cannot get tag updates from OPC DA Server
- The QuickClient shows Quality = BAD, error Bad Vartype
- It's shown Failed to connect to server on channel XXXXX in EventLog
- OPC DA connectivity issue
- The event log in KEPServerEX shows Source: OPC DA CLIENT and Event: Failed to connect to server on channel '*****'
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