Article - CS293196
Error "Missing Application Key" is logged repeatedly in the Application Log on the ThingWorx Platform
Modified: 28-Jul-2025
Applies To
- ThingWorx Platform 8.0 to 9.7
- Kepware Server (formerly KEPServerEX) 6.0.2107.0 to 6.9
- ThingWorx Edge SDK 5.0 to 7.0.1
Description
- ThingWorx fails to connect to KEPServerEX with repeated errors in the ThingWorxStorage/logs/ApplicationgLog.log:
[L: ERROR] [O: c.t.c.s.c.j.Jsr356ServerConnection] [I: ] [U: ] [S: ] [T: http-nio-443-exec-5] Error [authenticating connection], Server websocket will be closed. cause: Missing application key! "Error executing API request message, sending error response to caller!"
- Need to determine what device is attempting to connect to the Platform with a bad Application Key (appKey)
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