Article - CS382489
"Connection failed through the OPC DA interface because the maximum simultaneous OPC group limit <VALUE> was reached" in PTC Kepware products
Modified: 20-Feb-2026
Applies To
- ThingWorx Kepware Server (legacy) 6.12.325.0 to 6.18
- Kepware Server (formerly KEPServerEX) 6.12.325.0 to 7.0
Description
- Error message displayed:
- Connection failed through the OPC DA interface because the maximum simultaneous OPC group limit <VALUE> was reached
- Failed to add group '<GROUP_NAME>' to '<KEPWARE_SERVER_NAME>' (HR=0x80004005) error in QuickClient
- Connection to device interrupted
- No data is received in client application
- Is it possible to increase the number of maximum connections for OPC DA Groups in PTC Kepware products
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