are you trying to browse the repository, or do you have an existing working copy you are trying to update? i think you are probably not entering a proper svn repository url. just because the browser is working, does not mean that is the right url for the client. it might be. it depends whether you are browsing the repository directly or using a web gui.

the problem could also be related to a proxy server. if you need a proxy server, odds are that your web browser is already configured to use it. however, svn clients have their own configuration for proxies that has to be configured separately.

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