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Forum Discussion

Andy_304337's avatar
Andy_304337
Icon for Cirrus rankCirrus
Dec 31, 2018

Slowness issue / tcp window

Hi all   There is a slowness issue I am diagnosing with a url hosted on ltm in data center. The url is a plain vip on 443 which has tcp, client ssl & default server profile.   While I did tcpd...
application delivery
BIG-IP
LTM
Dylan_375544's avatar
Dylan_375544
Icon for Cirrocumulus rankCirrocumulus
Dec 31, 2018

It sounds like the back end server may be being over loaded.

 

If a window size is 0, that means that the buffer is full and the server cant receive any more data.

 

HERE is some more info from wireshark.

 

Hope that helps! If it does please up-vote and select this answer, it'd be greatly appreciated!

 

-Dylan

 

Andy_304337's avatar
Andy_304337
Icon for Cirrus rankCirrus
Jan 01, 2019

Hi Dylan

 

Thank you for your response and a happy new year.

 

Agree with tcp zero window. But how do we continue to investigate with tcp full window & tcp window update ?