Information provided by remote host is not captured when channel session is rejected

I've got an intermittent crash I'd like to track down a bit better:

Unhandled Exception: Renci.SshNet.Common.SshException: Failed to open a channel after 10 attempts.
   at Renci.SshNet.Channels.ChannelSession.Open()
   at Renci.SshNet.ScpClient.Download(String filename, FileInfo fileInfo)
   at AtlasSSH.SSHConnection.CopyRemoteFileLocally(String lx, FileInfo localFile, Action`1 statusUpdate, Func`1 failNow)
   at AtlasWorkFlows.Locations.PlaceLinuxRemote.CopyFromRemoteToLocal(String dsName, String[] files, DirectoryInfo ourpath, Action`1 statusUpdate, Func`1 failNow)
   at AtlasWorkFlows.Locations.PlaceLocalWindowsDisk.CopyFromSCPTarget(IPlace origin, Uri[] uris, Action`1 statusUpdate, Func`1 failNow)

I can see the spot where this error occurs in the source code. But the reasons for the error or failure to open seem to fail. This failure occurs after 15 or 20 connections are opened (and I think closed) to the same machine. And it doesn't always happen.

How can I better track down what is causing this failure?

Beginne bei Renci.SshNet.Channels.ChannelSession.Open() und verfolge den Fehler bis in ScpClient.Download(), wobei der gemeldete Stack Trace als Einstiegspunkt dient. Reproduziere die intermittierende Ablehnung nach wiederholten Verbindungen und ermittle, welche Informationen über den Remote-Host verloren gehen; die Aufgabe ist abgeschlossen, wenn der Fehler genügend Kontext offenlegt, um seine Ursache zu identifizieren.