Cannot authenticate with Svn repository

On the Specify Source Repository screen, I have entered the subversion repository url(http://scm.fftw.com), userid and password, when it tries to connect, an error of: 'This is not a valid Subversion Repository: svn: PROPFIND of '/svn/active': 500 Internal Server Error (http://scm.fftw.com)'
Our subversion server uses the Windows Domain Authentication(mod_auth_sspi, http://www.subversionary.org/sspidomainauth), our subversion server authentication works fine with other tools such as subclipse, tortoise svn, and we are able to browse our repository via a browser. It just doesn't work with Bamboo for some reason.

Here is the stack trace from Bamboo:
INFO | jvm 2 | 2007/02/23 13:40:37 | 2007-02-23 13:40:37,317 INFO [SocketListener0-1] [SvnRepository] Failed to validate the subversion url
INFO | jvm 2 | 2007/02/23 13:40:37 | org.tmatesoft.svn.core.SVNException: svn: PROPFIND of '/svn/active': 500 Internal Server Error (http://scm.fftw.com)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:48)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.tmatesoft.svn.core.internal.io.dav.DAVUtil.findStartingProperties(DAVUtil.java:124)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.tmatesoft.svn.core.internal.io.dav.DAVConnection.fetchRepositoryUUID(DAVConnection.java:88)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.tmatesoft.svn.core.internal.io.dav.DAVRepository.testConnection(DAVRepository.java:78)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.repository.svn.SvnRepository.validate(SvnRepository.java:477)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.ww2.actions.build.admin.config.ConfigureBuildRepository.validate(ConfigureBuildRepository.java:60)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:123)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.ww2.interceptors.BambooWorkflowInterceptor.doIntercept(BambooWorkflowInterceptor.java:33)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:81)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:115)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.ww2.interceptors.BambooValidationInterceptor.doIntercept(BambooValidationInterceptor.java:33)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:81)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.webwork.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:171)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.ww2.interceptors.BasePermissionCheckInterceptor.intercept(BasePermissionCheckInterceptor.java:38)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:151)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.ww2.interceptors.PaginationAwareInterceptor.intercept(PaginationAwareInterceptor.java:68)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.ww2.interceptors.StatisticsAwareInterceptor.intercept(StatisticsAwareInterceptor.java:42)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.ww2.interceptors.ResultsListAwareInterceptor.intercept(ResultsListAwareInterceptor.java:43)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.ww2.interceptors.TestCaseAwareInterceptor.intercept(TestCaseAwareInterceptor.java:43)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.ww2.interceptors.BuildAwareInterceptor.intercept(BuildAwareInterceptor.java:40)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:100)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.ww2.interceptors.BuildConfigurationInterceptor.intercept(BuildConfigurationInterceptor.java:132)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.ww2.interceptors.BuildConfigurationFromSessionInterceptor.intercept(BuildConfigurationFromSessionInterceptor.java:46)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:113)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.webwork.dispatcher.DispatcherUtils.serviceAction(DispatcherUtils.java:233)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.webwork.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:198)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.opensymphony.webwork.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:78)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:264)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:107)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:72)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:274)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:110)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:274)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:274)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.filter.SeraphLoginFilter.doFilter(SeraphLoginFilter.java:56)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:274)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:191)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:274)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:148)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:90)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.filter.BambooAcegiProxyFilter.doFilter(BambooAcegiProxyFilter.java:25)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.filter.LicenseFilter.doFilter(LicenseFilter.java:71)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.johnson.filters.JohnsonFilter.doFilter(JohnsonFilter.java:91)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:182)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.seraph.filter.LoginFilter.doFilter(LoginFilter.java:177)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.springframework.orm.hibernate.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:174)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.spring.filter.FlushingSpringSessionInViewFilter.doFilterInternal(FlushingSpringSessionInViewFilter.java:29)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.filter.CompressingFilter.doFilter(CompressingFilter.java:69)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
INFO | jvm 2 | 2007/02/23 13:40:37 | at com.atlassian.bamboo.filter.RequestCacheThreadLocalFilter.doFilter(RequestCacheThreadLocalFilter.java:26)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:473)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:635)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.jetty.plus.PlusWebAppContext.handle(PlusWebAppContext.java:158)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.http.HttpServer.service(HttpServer.java:954)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
INFO | jvm 2 | 2007/02/23 13:40:37 | at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)