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Forum Discussion

Hamza's avatar
Hamza
Icon for Cirrus rankCirrus
Jan 19, 2023

I can't open PDF through F5 LTM/ASM

Hello,

I have an issue with my ASM, i am not able to open a pdf file when using F5 under F5 even if is legal request :

 

Please, any idea about this issue ?

 

security

4 Replies

  • Hooni_L's avatar
    Hooni_L
    Icon for Cirrus rankCirrus
    Jan 19, 2023

    Hi

    in my case

    abnomal http protocol.

    if you can check the content length, Because Web Firewall solutions view content sizes, signatures are detected when data sizes are different.

    • Hamza's avatar
      Hamza
      Icon for Cirrus rankCirrus
      Jan 19, 2023

      Hi Hooni_L ,

      Thanks

      Please note that i have fotgate FW, and test is done without F5.

      So FW has not impact.

  • Mohamed_Ahmed_Kansoh's avatar
    Mohamed_Ahmed_Kansoh
    Icon for MVP rankMVP
    Jan 19, 2023

    Hi Hamza , 
    Try to disable ASM policy first from your Virtual server and see if this fixed this issue or not ,

    -if yes you should see what makes ASM to block opening or downloading PDF files requests ,

    -If not you should disable http profile from your virtual server and change virtual server type from standard to performance layer 4 " If this available with you and this web site does not serve production services now " , if this issue resolved , I recommend to disable http parsing against PDF files as clarified in the below KB : 


    https://support.f5.com/csp/article/K00445006

    but first differentiate if this an ASM issue or not. 

    I hope this helps you