Article - CS227933
"Error occurred while validating HTTP header: cookie" message frequently appearing in ThingWorx Application Log
Modified: 14-Oct-2025
Applies To
- ThingWorx Platform 6.0 to 9.6
Description
- /ThingworxStorage/logs/ApplicationLog.log contains a large number of Error occurred while validating HTTP header: cookie messages
- Percent Character (%) in HTTP cookie value, sent to ThingWorx, triggers a cookie parse error
- Long Cookie strings sent as part of an HTTP request to ThingWorx can cause an Error occurred while validating HTTP header: cookie message to be logged to the Application Log
- Error message provided does not provide a specific reason for the validation failure, just that the validation failed
- org.apache.coyote.http11.Http11Processor.service Error parsing HTTP request headerthingworx_1
- Credentials do not match a valid username-password combination for this Organization. Try again.
- Database connectivity and performance issues seen due to this error
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