ppm执行时,怎么出现不能连接的错误啊?

ppm执行时,怎么出现不能连接的错误啊?

Synchronizing Database ...
  Downloading ActiveState Package Repository packlist ... failed 500 Can't connect to ppm4.activestate.com:80 (connect: Unknown error)
请设定proxy...
HTTP_proxy
HTTP_proxy_user
HTTP_proxy_pass
换一个ppm source