concrete5 installation

hello,
i've recently install cherokee 1.3.0 A2 and i hav a problem when i trying to
install
concrete 5.
during the installation process, after a message "install dashbord", i get
the message
"*504 Gateway Timeout*".
i don't know if it is relate to cherokee or to concrete.How can i get rid of
this?
thanks

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