Forum Discussion

Ayush_Gupta_332's avatar
Ayush_Gupta_332
Icon for Nimbostratus rankNimbostratus
Jul 16, 2018

WAF Request length exceeds defined buffer size

Hi All,

 

We are seeing support ID while uploading a file with file type as no extension (no_ext).

 

So we have created a custom File Type in Allowed File Types, details

 

no_ext, Request Length is 30MB and POST DATA LENGHT is also 30 MB.

 

But we still see WAF ID for the following error: 'Request length exceeds defined buffer size', which points to long_request_buffer_size which is set to 10MB.

 

My question is

 

  1. Why WAF ID comes for 'Request length exceeds defined buffer size' when I have increased the Request Length to 30 MB for the file type: 'no_ext' ?

     

  2. Does internal parameter 'long_request_buffer_size' takes precedence over the defined Request Length for no_ext File type?

     

Any suggestions would be very helpful.

 

Thanks, Ayush

 

ASM Advanced WAF
security
  • youssef1's avatar
    youssef1
    Icon for Cumulonimbus rankCumulonimbus
    Jul 16, 2018

    Hi,

     

    First of don't forget that increasing the long_request_buffer_size parameter value will increase the allowed size of all requests processed by the BIG-IP ASM system.

     

    More changing the long_request_buffer_size parameter value requires that you restart the BIG-IP ASM service, resulting in a brief traffic disruption. Did you do that?

     

    https://support.f5.com/csp/article/K7935

     

    Keep me in touch. regards,