Cannot install rails. Set that proxy.

If you are installing gems or rails over a proxy, you may encounter the following problems.

Remember to set your proxy first as below:

In Windows:
gem install rails
ERROR: http://gems.rubyforge.org/ does not appear to be a repository

Before we begin, if you are behind a proxy, open the command prompt and give the following command:

 >Set HTTP_PROXY=http://:

For example, if the address of the proxy server is 192.168.1.1 and the port number is 9090, then you would have to give the following at the command prompt:

 >set HTTP_PROXY=http://192.168.1.1:9090 

Next, give the following command at the prompt:

 >gem update