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= Preferences > Proxy =

[[JOSMImage(preferences/proxy,48,link=,middle,margin-right=20)]]

Configure whether to use a proxy server

JOSM communicates with the OSM server using the Hypertext Transfer Protocol ([https://en.wikipedia.org/wiki/Http HTTP]). If required it can relay its requests through a [https://en.wikipedia.org/wiki/Http_proxy HTTP proxy] or a [https://en.wikipedia.org/wiki/SOCKS SOCKS proxy].

1. Go to the register **Proxy** in the Preferences
1. Select one of the available options and enter additional configuration parameters 
1. Save the preferences 

[[Image(wiki:Help/Preferences/Connection:proxy-settings.png,500,link=)]]


== Using the standard system proxy ==
If you always want to use the proxy defined as standard proxy on your computer you have to start up JOSM with a special command. The command line has to include the parameter `-Djava.net.useSystemProxies=true`, for instance 

  {{{
#!cmd
java -Djava.net.useSystemProxies=true -jar josm.jar
  }}}

== Using the manually configured proxy ==
If there is a need for personal authentication for your proxy, remember to include the NT-domain with your username, e.g. ''domain\username''. This issue is due to proxy implementation in `java.net.HttpURLConnection`.

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