Article - CS436358

Server Runtime crashes with error in windows event log "Faulting module path: C:\Windows\System32\ucrtbase.dll" in PTC Kepware Products

Modified: 16-Jul-2026   


Applies To

  • Kepware Server (formerly KEPServerEX) 6.0.2107.0 to 7.1
  • ThingWorx Kepware Server (legacy) 8.0 to 6.18

Description

  • Server Runtime experiences crashes frequently
  • Error message details noted in Windows event log: 
Faulting module path: C:\Windows\System32\ucrtbase.dll
  • Crash occurs during startup or regular operation of PTC Kepware products
  • Error related to ucrtbase.dll module
  • May affect stability and operational consistency of Kepware server
  • User is experiencing server_runtime.exe crashing(crashing with the faulting module ucrtbase.dll ), especially after controllers restart from a power outage with windows event error code c0000409 for buffer overrun
  • When Ignition is connected as an OPC UA client, User is seeing Buffer Overflow crashes every minute, Primarily, these are on ucrtbase.dll
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