title: Why am I getting "svn: connection refused by the server"?
body: <p>We have a Continuous Integration environment setup with TeamCity and subversion. TeamCity 
  gets the latest source from svn and does a build (Visual Studio) on every commit.</p>
  
  <p>Sometimes we get the following TeamCity error when the build runs.  Doing a couple of force builds gets TeamCity running succesfully.  </p>
  
  <pre><code>**Build errors
  [12:35:24]: Patch is broken, can be found in file: C:\TeamCity\buildAgent\temp\cache\temp6036patch_803[12:35:24]: RunBuildException when running build stage UpdateSourcesFromServer: Failed to build patch for build 519 {build id=803}, VCS root: svn: https://svn.myDomain.com/repos/myApplication {id=2}, due to error: org.tmatesoft.svn.core.SVNException: svn: connection refused by the server
  svn: REPORT request failed on '/repos/myApplication/!svn/vcc/default'**
  </code></pre>
  
  <p>Any ideas why this might be happening ?</p>
  
  <p>Here is part of the build log </p>
  
  <pre><code>[12:58:39]:  [Updating sources: server side checkout...] Transferring cached clean patch for VCS root: [svn url]
  [12:58:40]:  [Updating sources: server side checkout...] Building incremental patch over the cached patch
  [12:59:30]:  [Updating sources: server side checkout...] Failed to build patch for build 146 {build id=806}, VCS root: svn: [svn url]{id=2}, due to error: org.tmatesoft.svn.core.SVNException: svn: connection refused by the server
  svn: REPORT request failed on '[svn url]!svn/vcc/default'
  [12:59:30]:  [Updating sources: server side checkout...] Repository sources transferred: 14.08Mb total
  [12:59:30]:  [Updating sources: server side checkout...] Average transfer speed: 280.89Kb per second
  [12:59:30]: Will repeat attempt when server will be available, number of attempts left: 2
  [12:59:40]: Updating sources: server side checkout...
  
  
  jetbrains.buildServer.agent.impl.patch.PatchDownloaderImpl$1: Server was not able to build correct patch, most likely due to VCS errors, will try again.
  jetbrains.buildServer.agent.impl.patch.PatchDownloaderImpl$1: Server was not able to build correct patch, most likely due to VCS errors, will try again.
      at jetbrains.buildServer.agent.impl.patch.PatchDownloaderImpl.throwError(PatchDownloaderImpl.java:113)
      at jetbrains.buildServer.agent.impl.patch.PatchDownloaderImpl.checkPatch(PatchDownloaderImpl.java:103)
      at jetbrains.buildServer.agent.impl.patch.PatchDownloaderImpl.copyPatchAndCheck(PatchDownloaderImpl.java:64)
      at jetbrains.buildServer.agent.impl.patch.UpdateSourcesPatcherBase.copyPatchToTempFile(UpdateSourcesPatcherBase.java:65)
      at jetbrains.buildServer.agent.impl.patch.UpdateSourcesFromServer.updateSources(UpdateSourcesFromServer.java:58)
      at jetbrains.buildServer.agent.impl.patch.UpdateSourcesBuildStageBase.doSourceUpdate(UpdateSourcesBuildStageBase.java:74)
      at jetbrains.buildServer.agent.impl.patch.UpdateSourcesBuildStageBase.doRecoverableStage(UpdateSourcesBuildStageBase.java:52)
      at jetbrains.buildServer.agent.impl.runStages.RecoverableBuildStage.doLastAttempt(RecoverableBuildStage.java:101)
      at jetbrains.buildServer.agent.impl.runStages.RecoverableBuildStage.doBuildStage(RecoverableBuildStage.java:58)
      at jetbrains.buildServer.agent.impl.BuildRunAction.callRunStage(BuildRunAction.java:119)
      at jetbrains.buildServer.agent.impl.BuildRunAction.doStages(BuildRunAction.java:83)
      at jetbrains.buildServer.agent.impl.BuildRunAction.access$000(BuildRunAction.java:18)
      at jetbrains.buildServer.agent.impl.BuildRunAction$1.run(BuildRunAction.java:56)
      at java.lang.Thread.run(Thread.java:595)
  Caused by: jetbrains.buildServer.vcs.patches.UnsuccessfulPatchException: Failed to build patch for build 146 {build id=806}, VCS root: svn: [svn url]{id=2}, due to error: org.tmatesoft.svn.core.SVNException: svn: connection refused by the server
  svn: REPORT request failed on '[svn url]!svn/vcc/default'
      at jetbrains.buildServer.vcs.patches.AbstractPatcher$1.fail(AbstractPatcher.java:93)
      at jetbrains.buildServer.vcs.patches.LowLevelPatcher.readPatchStream(LowLevelPatcher.java:156)
      at jetbrains.buildServer.vcs.patches.LowLevelPatcher.applyPatch(LowLevelPatcher.java:79)
      at jetbrains.buildServer.vcs.patches.AbstractPatcher.applyPatch(AbstractPatcher.java:42)
      at jetbrains.buildServer.agent.impl.patch.PatchApplierImpl.applyPatch(PatchApplierImpl.java:18)
      at jetbrains.buildServer.agent.impl.patch.PatchDownloaderImpl.checkPatchInFileIsCompleted(PatchDownloaderImpl.java:83)
      at jetbrains.buildServer.agent.impl.patch.PatchDownloaderImpl.checkPatch(PatchDownloaderImpl.java:93)
      ... 12 more
  </code></pre>