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 download failed.
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 ?
You will have to provide more information than that for any assistance here 🙂 Have you performed a tcpdump on client and server side? Have you tried to download the file via curl from thr F5? Can you share your virtual server config from bigip.conf?
Can you please provide any additional information? for example: virtual server configuration (virtual server type and profiles assigned) also, is the service working fine and only downloading files is failing?
what is the software version you are running? you can check for any BUG that you might be facing, for example:
Also, you can start generating a tcpdump and check the output, it will be clear as the service port is 80, you can use the below command to check out what is actually happennig on both client and server side.
#tcpdump -nnnveti 0.0:nnnp host 51.39.227.242 and port 80 -s0 -S -w /var/log/filename.pcap
replace the above IP with the client's IP, then open it in wireshark.
Can you also provide the config for the file_download.app/file_download_http object? Usually issues like these result from the HTTP profile.... can you try to remove this profile and re-attempt download to test?
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?
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 ?
