Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Nik2607's avatar
Nik2607
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Jan 07, 2022

iRule to set tcp timeout value for the specific URL

Hello Team, We have a requirement to set up an iRule to set the TCP timeout of 600 sec for a particular URL passing via F5 VIP. I took some help from the F5 Dev articles, here is the complete iRule ...
irules
security
JoshBecigneul's avatar
JoshBecigneul
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Jan 07, 2022

Hi  To expand on Daniel's reply, the example iRule in the Clouddocs site includes some more logic to help weed out edge cases, and to answer your question about "why we need "set serverside_idle_timeout 1"", that is because the details from HTTP::host don't exist inside of the SERVER_CONNECTED event without being transferred through a variable.

Nik2607's avatar
Nik2607
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Jan 28, 2022

Hello Experts,

The given iRule did not work and caused service interruptions. I have changed the syntax as below that resolved the issue - 

serverside_idle_timeout 1 replaced with update_serverside_idle_timeout 1

{$serverside_idle_timeout} replaced with {[info exists update_serverside_idle_timeout] && $update_serverside_idle_timeout}

can someone explain me please what is the exact difference in the old and new syntax?