Can't modify TNS timeout on database client outgoing request -

Dear all,
I have two Oracle Database connected by dblink over TCPIP. One is a client for the other.
When my client application (in db client) try to retrieve data from the db server and this one is shutdowned, It receives this message ORA-12535 "TNS:operatin time out" (no bad !) but after at minus 2 minutes and sometimes too long time. This is not good for my client application. I need about 30 sec for this application. When I launched oerr tools -with this sqlcode 12535 - to get some explanation, Oracle talks about CONNECT_TIMEOUT parameter in listener.ora file, I did not think this was relation with my issue (because I want to connect and not to listen) but I tested and it did not work.
Is someone know how to manage this time out ?
Tkanks by advance
Regards.

I Frederic,
Thank for your reply.
Yes I restarted the listener after the update - I also tested dynamic mode with set command ....- but it didn't work.
I think like I previously said CONNECT_TIMEOUT is not the good parameter because this is for the listener and for my client db I don't need it.
The server machine is sometimes under stress because many access and many applications and sometimes we have to do some maintenance works. I need to get an acceptable response time in timeout to switch all requests to another server.
Regards.

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Can't modify TNS timeout on database client outgoing request -

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