I have been having problems updating and installing new software in Eclipse, and the problem appears to be related to svn. It seems that I can duplicate the problems using svn info as shown in text below. I am running the latest version of Snow Leopard on a MacBook Pro. I received the 405 error with another site, but it went away when I used a mirror. Note that the redirected site for polarion.com appears to be the same one I had just entered. I have seen other entries on Google mentioning the 405 error. As it is, I can't update Google Web Tools.
BradleyRossMacBook:~ bradleyross$ svn --version svn, version 1.6.16 (r1073529) compiled Mar 10 2011, 10:18:52 Copyright (C) 2000-2009 CollabNet. Subversion is open source software, see http://subversion.apache.org/ This product includes software developed by CollabNet (http://www.Collab.Net/). The following repository access (RA) modules are available: * ra_neon : Module for accessing a repository via WebDAV protocol using Neon. - handles 'http' scheme - handles 'https' scheme * ra_svn : Module for accessing a repository using the svn network protocol. - with Cyrus SASL authentication - handles 'svn' scheme * ra_local : Module for accessing a repository on local disk. - handles 'file' scheme * ra_serf : Module for accessing a repository via WebDAV protocol using serf. - handles 'http' scheme - handles 'https' scheme BradleyRossMacBook:~ bradleyross$ svn info http://dl.google.com svn: Server sent unexpected return value (405 Method Not Allowed) in response to OPTIONS request for 'http://dl.google.com' BradleyRossMacBook:~ bradleyross$ svn info http://community.polarion.com/projec ts/subversive/download/eclipse/2.0/helios-site/ svn: Repository moved permanently to 'http://community.polarion.com/projects/subversive/download/eclipse/2.0/helios-site/'; please relocate BradleyRossMacBook:~ bradleyross$ svn info http://dl.google.com/eclipse/plugin/ 3.6 svn: Server sent unexpected return value (405 Method Not Allowed) in response to OPTIONS request for 'http://dl.google.com/eclipse/plugin/3.6' BradleyRossMacBook:~ bradleyross$