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Militza's avatar
Militza
Icon for Nimbostratus rankNimbostratus
Jun 28, 2023
Solved

Unable to download 15 MB excel file through LTM.

We have configured HTTP application with port 80 on F5 LTM. We trying to download excel file using that application downloading gets failed after few minutes. No logs found in var/ltm realated to do...
application delivery
  • Mohamed_Ahmed_Kansoh's avatar
    Mohamed_Ahmed_Kansoh
    Jun 28, 2023

    Hi Militza , 

    Do you see in Packet captures >>> ( TCP Window Full & TCP zero window ) while downloading this file ? 

    >Btw , Try to remove the HTTP Profile and use ( Performance layer 4 ) and Test. 

    >Are there any firewalls between F5 Bigip and Servers or between F5 Bigip and Client ).

    > Maybe adjusting window scalling solve your issue , but first tell us if you see ( TCP Window Full & TCP zero window ) flags or not in your captures ? 

whisperer's avatar
whisperer
Icon for MVP rankMVP
Jun 28, 2023

Nothing obvious here that could be causing your issues. Although, the multiple re-transmits is a bit telling. Not sure if this is a new setup, or an older F5 BIG-IP installation. Did you also check the speed/duplex negotiation on the swithports and if you see any drops or issues there?