Upstream timed out on installation

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Hello,

i wanted to do a test installation of centova 3.
Provided a blank debian wheezy server and started the installation with the parameters "--deps --shoutcast-all --icecast-all".
Installscript worked fine, created database and connected to the webserver for the final setup.
Connected to the webpage using http://ip:2199/
On the webpage i entered the credentials and database-details and proceeded.
This step always fails (now already the 3rd time).

Frontend error message:
504 Gateway Time-out
cc-web/1.2.9

Error message in cc-web.log:
[error] 13186#0: *36 upstream timed out (110: Connection timed out) while reading response header from upstream, client: myclientip, server: centovacast, request: "POST /install.php?step=settings HTTP/1.1", upstream: "fastcgi://unix:/usr/local/centovacast/var/run/cc-appserver.sock", host: "ip:2199", referrer: "http://ip:2199/install.php?step=settings"

Why does this happen?
The frontend seems to work but i don't know wether there are some steps now which were skipped.
How can i confirm everything is fine?

Best regards
Azrael