If you want to use Subclipse( an svn plugin for eclipse ) and you are behind your company’s ISA Server, you need to tell the Subclipse to use proxy while accessing outside:
1. Go to C:\Documents and Settings\[User Name]\Application Data\Subversion
2. Edit the servers file, in the bottom of the file, uncomment the proxy settings and input your proxy server information and save the file:
3. Restart Eclipse and see if it works.