I installed xwiki correctly and after that i wanted to install extension… But ! My xwiki don’t find any extension.
In my log I have this : error Log proxy .txt (725 Bytes).
In first time I think about a problem on the proxy but I configured it proprely (in catalina.sh) : JAVA_OPTS="$JAVA_OPTS -Dappserver.home=$CATALINA_HOME -Dappserver.base=$CATALINA_HOME -Dhttp.proxyHost=Address_proxy -Dhttp.proxyPort=Proxy_Port-Dhttps.proxyHost=Address_proxy -Dhttps.proxyPort=Proxy_Port -Xmx512m -XX:MaxPermSize=196m $XWIKI_OPTS"
You have lot of missing white space and - in what you pasted but I guess it’s just a copy/paste mistake. Also https.proxy.Password does not exist, it’s https.proxyPassword as far as I can find on Google (and that’s for https, you also have http versions like for the host/port).
That’s weird, the error suggest that you get a 404 for http://extensions.xwiki.org/xwiki/rest/repository/search?start=0&number=20&q= (this reminds me that the default need to be changed to https…).
Me neither unfortunately, this URL obviously does not return 404 so there seems to be a problem in the proxy but no idea what it can be without more info.