Hi Clemens,
I have to admit that I have been running out of ideas why the wiki cannot get a connection while "curl" can.
One last try: has the gateway connecting the local network to the internet an application firewall or the like ? Something that sniffs user-agents for http connections and only allows "known ones" ?
Not to my knowledge, but see below
The java client used by the XWiki installation wizard might be emulated with:
curl --user-agent "history" http://extensions.xwiki.org
$ curl --user-agent "history" http://extensions.xwiki.org <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>302 Found</title> </head><body> <h1>Found</h1> <p>The document has moved <a href="http://extensions.xwiki.org/xwiki/bin/view/Main/WebHome">here</a>.</p> </body></html> $
if this works, too, I have to admit I have no clue why it does not work. (Btw, there should be an error message in the log files. Is there anything like that?)
In fact, there is a single error being printed to logs/catalina.out /after/ I click the "continue" button in the first step of the Distribution Manager: [...] 2016-01-28 13:36:53,762 [Active Installs Ping Thread] WARN a.i.c.ActiveInstallsPingThread - Failed to send Active Installation ping to [http://extensions.xwiki.org/activeinstalls]. Error = [ConnectException: Connection timed out]. Will retry in [86400] seconds... [...] I don't know what an "Active Installation ping" is, but in fact while I seem to be able to access this webpage: $ curl http://extensions.xwiki.org/activeinstalls { "status" : 200, "name" : "Bobster", "version" : { "number" : "1.1.1", "build_hash" : "f1585f096d3f3985e73456debdc1a0745f512bbc", "build_timestamp" : "2014-04-16T14:27:12Z", "build_snapshot" : false, "lucene_version" : "4.7" }, "tagline" : "You Know, for Search" } $ I cannot `ping` it: $ ping extensions.xwiki.org PING www.xwiki.org (104.31.71.57) 56(84) bytes of data. ^C --- www.xwiki.org ping statistics --- 76 packets transmitted, 0 received, 100% packet loss, time 75445ms $ Does the Distribution Manager execute a real "ping" command even though the webpages are accessible? And if yes, how can I avoid this? I doubt that our networking dept. will adapt any gateway configuration to to make a single software installation possible :-} Cheers Frank