Invalid handle for simultaneous downloads. #1731

Activity

1. Rob-Hague commented on Nov 5, 2025

   

   Rob-Hague

   on Nov 5, 2025

   Collaborator

   More actions

   Please give it a try with 2025.1.0? There have been 2 relevant fixes since 2024.2.0: #1623 and #1643
2. m0a0k0s commented on Nov 5, 2025

   

   m0a0k0s

   on Nov 5, 2025

   Author

   More actions

   ok, I updated to 2025.1, will check next week
3. m0a0k0s commented on Nov 18, 2025

   

   m0a0k0s

   on Nov 18, 2025

   Last edited by m0a0k0s

   Author

   More actions

   Finally updated to 2025.1.0 with dsa rollbacked. Error is still reproducing.

   			"HResult": -2146233088,
   			"Message": "Invalid handle.",
   			"Source": "System.Private.CoreLib",
   			"StackTrace": "   at Renci.SshNet.SftpClient.InternalUploadFile(Stream input, String path, Flags flags, SftpUploadAsyncResult asyncResult, Action`1 uploadCallback, Boolean isAsync, CancellationToken cancellationToken)\r\n
   			"TargetSite": "Void Throw()",
   			"StatusCode": "9",
   			"Type": "Renci.SshNet.Common.SftpException"
   
   
4. juliannamello commented on Dec 16, 2025

   

   juliannamello

   on Dec 16, 2025

   More actions

   I'm encountering this as well. I tested with file upload

   This code fails - not every single time, but pretty consistently:

           var client = new Renci.SshNet.SftpClient(_configuration["SftpHost"], _configuration["SftpUsername"], _configuration["SftpPassword"]);
           await client.ConnectAsync(ct);
   
           await Parallel.ForEachAsync(Enumerable.Range(1, 16), new ParallelOptions
           {
               MaxDegreeOfParallelism = 5,
               CancellationToken = ct,
           }, async (i, token) =>
           {
               using FileStream fs = File.OpenRead($"C:/tmp/{i}.txt");
               await client.UploadFileAsync(fs, $"jmello_test/{i}.txt", ct);
           });
   

   I tried increasing MaxDegreeOfParallelism to 16 in the above example and never saw an error

   I also tried switching to synchronous execution and did not see an error:

           var ct = CancellationToken.None;
   
           var client = new Renci.SshNet.SftpClient(_configuration["SftpHost"], _configuration["SftpUsername"], _configuration["SftpPassword"]);
           await client.ConnectAsync(ct);
   
           Parallel.ForEach(Enumerable.Range(1, 16), new ParallelOptions
           {
               MaxDegreeOfParallelism = 5,
               CancellationToken = ct,
           }, async (i, token) =>
           {
               using FileStream fs = File.OpenRead($"C:/tmp/{i}.txt");
               client.UploadFile(fs, $"jmello_test/{i}.txt");
           });
   

   Here are the exception details:

     Message: 
       Renci.SshNet.Common.SftpException : Invalid handle.
   
     Stack Trace: 
       SubsystemSession.<WaitOnHandleAsync>g__DoWaitAsync|38_0[T](TaskCompletionSource`1 tcs, Int32 millisecondsTimeout, CancellationToken cancellationToken)
       SftpClient.InternalUploadFile(Stream input, String path, Flags flags, SftpUploadAsyncResult asyncResult, Action`1 uploadCallback, Boolean isAsync, CancellationToken cancellationToken)
       <<FailsWhenAll>b__0>d.MoveNext() line 26