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Unable to upload Large files (greater than 10MB) to web app, when WAF is enabled

 

Information

 

Summary:

User unable to upload large files (14MB size) to website behind the LoadMaster.

Environment:

Product: Loadmaster

Version: 7.2.56.0 or earlier

Platform: Any

Application: Any 

Question/Problem Description:

Failure when attempting to upload large files to the application through the LoadMaster VIP when WAF is enabled.

Steps to Reproduce:  
Error Message: 2022-10-07T12:22:58+08:00 KEMP-LB wafd: [client x.x.x.x] ModSecurity: Request body (Content-Length) is larger than the configured limit (13107200). [hostname "x.x.x.x (egls IIS Services)"] [uri "/documentdeposit/store"] [unique_id "f6fb6bf6-aaf4-4eb1-abe1-2b5faef6bee2"]
Defect Number:  
Enhancement Number:  
Cause:
  • Firmware version before 7.2.57.0 "WAF Request Body Size Limit" allowed is 10MB
  • Firmware version 7.2.57.0 increased the "WAF Request Body Size Limit" to 50MB.
Resolution: Upgrade firmware to 7.2.57.0 or later to have a larger file size limit.
Workaround:  
Notes: LoadMaster 7.2.57.0 Release Notes

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