Forum Discussion

Cirrus

Oct 12, 2023

F5 LTM cookie persistence encryption issue

folks, what is the default behaviour when cookie encrytion enabled, set to required. we know the client->F5 cookie is encrypted, how about F5->server?. i could see the cookie is decrypted in the cap...

application delivery

security

Mohamed_Ahmed_Kansoh

MVP

Oct 12, 2023

Hi Prakin ,

Cookie persistence encrypt is a way to secure the tampering in the client-side not server side.

have a look here : https://my.f5.com/manage/s/article/K15673279

Prakin

Cirrus

Oct 12, 2023

Hi Mohamed_Ahmed_Kansoh,

is there way that we can re-encrypt the cookie on server side. Because my connection flow, the backend application will hit the same F5 vip again where it sees an unecrypted cookie, but F5 is expecting encrypted cookie so instead it makes new load balancing decision and new cookie is generated and terminated in different server. This makes the connections inconsistencies.

client - > F5 -> webserver(10.10.10.10,20.20.20.20) -> kong -> F5 -> application server(10.10.10.10,20.20.20.20)

here my bothe web and application server are same address.

if i set the cookie to "prefered" i think it will work?. but on the client i would see unencrypted cookie as well. so that's why i am looking for ree-ncrypt the cookie on the server side.