Index: redmine/app/helpers/repositories_helper.rb
===================================================================
--- redmine/app/helpers/repositories_helper.rb  (revision 2697)
+++ redmine/app/helpers/repositories_helper.rb  (working copy)
@@ -147,7 +147,7 @@

   def subversion_field_tags(form, repository)
       content_tag('p', form.text_field(:url, :size => 60, :required => true, :disabled => (repository && !repository.root_url.blank?)) +
-                       '<br />(http://, https://, svn://, file:///)') +
+                       '<br />(http://, https://, svn://, svn+tunnelscheme://, file:///)') +
       content_tag('p', form.text_field(:login, :size => 30)) +
       content_tag('p', form.password_field(:password, :size => 30, :name => 'ignore',
                                            :value => ((repository.new_record? || repository.password.blank?) ? '' : ('x'*15)),
Index: redmine/app/models/repository/subversion.rb
===================================================================
--- redmine/app/models/repository/subversion.rb (revision 2697)
+++ redmine/app/models/repository/subversion.rb (working copy)
@@ -20,7 +20,7 @@
 class Repository::Subversion < Repository
   attr_protected :root_url
   validates_presence_of :url
-  validates_format_of :url, :with => /^(http|https|svn|svn\+ssh|file):\/\/.+/i
+  validates_format_of :url, :with => /^(http|https|svn(\+[^\s:\/\\]+)?|file):\/\/.+/i

   def scm_adapter
     Redmine::Scm::Adapters::SubversionAdapter