Sitting behind a firewall is mostly the cause of such troubles.

In this case you 
1. need to tell maven about how to reach out through the firewall
2. and you need to tell ant about how to reach out through the firewall
        a) when called alone from a shell
        b) when called from the ant plugin (or vice vers) under maven

general for maven documented (but sometimes not enough i.e. no 
http.auth.preference=BAsic hint can be passed by maven to the proxy which needs 
this to not start negotiating with the client, where as the client might not 
always be able to negotiate a authentication schema.
<proxies> 
   <proxy> 
        <active>true</active>
        <protocol>http</protocol>
         <host>bcproxyserver.ch.winterthur.com</host>
         <port>8080</port>
         <username>myusername</username>
         <password>mypassword</password>
         <nonProxyHosts>*.wgrintra.net</nonProxyHosts>
         <id>default</id>
   </proxy>
</proxies>

for maven we use
MAVEN_OPTS=
-XX:MaxPermSize=512m -Xmx950m -Xms950m 
-Dhttp.auth.preference=Basic 
-Dhttp.proxyhost=proxyserver.com 
-Dhttp.proxyport=8080 
-Dhttp.proxyuser=myusername
-Dhttp.proxypassword=mypassword

For ant we use
ANT_OPTS=
-Dhttp.proxyHost=proxyserver.com 
-Dhttp.proxyPort=8080 
-Dhttp.proxyUser=myusername 
-Dhttp.proxyPassword=mypassword 
-Dhttp.auth.preference=Basic

AND most important, you should look at 
http://vouters.dyndns.org/tima/All-OS-ANT-ANT_and_URLs_authentication.html
and then say thanks to Philippe Vouters, which has documented so nicely what we 
have done in the past to make ant going

Josef






-----Ursprüngliche Nachricht-----
Von: Brett Porter [mailto:br...@porterclan.net] Im Auftrag von Brett Porter
Gesendet: Dienstag, 22. Januar 2013 06:39
An: Maven Developers List; Shixiang Wen
Betreff: Re: Default remote repository URL is invalid to build Maven


On 21/01/2013, at 9:25 PM, Shixiang Wen <wsxwin...@yahoo.com.cn> wrote:
> pull:
> [artifact:pom] Downloading: 
> org/apache/maven/maven-parent/21/maven-parent-21.pom from repository 
> central at http://repo1.maven.org/maven2 [artifact:pom] Error 
> transferring file: Connection timed out: connect

It seems that the place you were building this was unable to reach 
http://repo1.maven.org/maven2 at the time of the build (connection timed out) - 
if you're able to resolve that issue so it can connect to it then it should 
work without changes.

Regards,
Brett

--
Brett Porter
br...@apache.org
http://brettporter.wordpress.com/
http://au.linkedin.com/in/brettporter
http://twitter.com/brettporter






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