diff --git a/SSH/SFTP.swift b/SSH/SFTP.swift
index d36422093..e3b187629 100644
--- a/SSH/SFTP.swift
+++ b/SSH/SFTP.swift
@@ -505,12 +505,16 @@ extension SFTPFile: BlinkFiles.Reader, BlinkFiles.WriterTo {
                         receiveRequest: receiveRequest(_:),
                         on: rloop)
       .flatMap(maxPublishers: .max(1)) { data -> AnyPublisher<Int, Error> in
+        self.log.message("WRITING \(data.count)", SSH_LOG_DEBUG)
         return w.write(data, max: data.count)
-      }.eraseToAnyPublisher()
+      }
+      .print()
+      .eraseToAnyPublisher()
   }
   
   private func receiveRequest(_ req: Subscribers.Demand) {
     self.demand = req
+    self.log.message("Received read request. Current demand \(self.demand).", SSH_LOG_DEBUG)
     self.inflightReadsLoop()
   }
 
@@ -536,6 +540,8 @@ extension SFTPFile: BlinkFiles.Reader, BlinkFiles.WriterTo {
       }
     }
     
+    self.log.message("Scheduled reads \(inflightReads.count). Current demand \(self.demand).", SSH_LOG_DEBUG)
+
     // Schedule more blocks to read. This way data will already be ready when we come back.
     while isComplete == false && inflightReads.count < self.maxConcurrentOps {
       let asyncRequest = sftp_async_read_begin(self.file, UInt32(self.blockSize))
@@ -545,7 +551,7 @@ extension SFTPFile: BlinkFiles.Reader, BlinkFiles.WriterTo {
       }
       inflightReads.append(UInt32(asyncRequest))
     }
-    
+        
     if let data = data, data.count > 0 {
       pub.send(data)
       // TODO Account for demand here
@@ -554,6 +560,8 @@ extension SFTPFile: BlinkFiles.Reader, BlinkFiles.WriterTo {
       }
     }
     
+    self.log.message("Next reads \(inflightReads.count). Current demand \(self.demand).", SSH_LOG_DEBUG)
+
     if isComplete {
       pub.send(completion: .finished)
       return
@@ -561,6 +569,7 @@ extension SFTPFile: BlinkFiles.Reader, BlinkFiles.WriterTo {
 
     // Enqueue again if there is still demand.
     if self.demand != .none {
+      self.log.message("Enqueuing next read block", SSH_LOG_DEBUG)
       rloop.schedule(after: .init(Date(timeIntervalSinceNow: 0.001))) {
         self.inflightReadsLoop()
       }
@@ -625,6 +634,11 @@ extension SFTPFile: BlinkFiles.Writer {
       var written = wn
       var isFinished = false
       
+      self.log.message("Scheduled writes \(inflightWrites.count).", SSH_LOG_DEBUG)
+      
+      ssh_channel_set_blocking(self.channel, 1)
+      defer { ssh_channel_set_blocking(self.channel, 0) }
+      
       if inflightWrites.count > 0 {
         // Check scheduled writes
         do {
@@ -647,9 +661,6 @@ extension SFTPFile: BlinkFiles.Writer {
         }
       }
       
-      ssh_channel_set_blocking(self.channel, 1)
-      defer { ssh_channel_set_blocking(self.channel, 0) }
-      
       // Schedule more writes
       while inflightWrites.count < self.maxConcurrentOps && write.count > 0 {
         var asyncRequest: UInt32 = 0
@@ -673,6 +684,8 @@ extension SFTPFile: BlinkFiles.Writer {
         write = write.subdata(in: length..<write.count)
       }
       
+      self.log.message("New writes \(inflightWrites.count).", SSH_LOG_DEBUG)
+
       if writtenBytes > 0 {
         // Publish bytes written
         pb.send(writtenBytes)
@@ -693,10 +706,13 @@ extension SFTPFile: BlinkFiles.Writer {
   
   func checkWrites() throws -> Int {
     var lastIdx = 0
-    
+        
     for block in inflightWrites {
+      self.log.message("sftp_async_write_end sent", SSH_LOG_DEBUG)
       let rc = sftp_async_write_end(self.file, block, 0)
+      self.log.message("sftp_async_write_end \(rc)", SSH_LOG_DEBUG)
       if rc == SSH_AGAIN {
+        self.log.message("Write AGAIN", SSH_LOG_DEBUG)
         break
       } else if rc != SSH_OK {
         throw FileError(title: "Error while writing block", in: session)
diff --git a/SSHTests/AuthTests.swift b/SSHTests/AuthTests.swift
index fbbea86f8..ac8b44adb 100644
--- a/SSHTests/AuthTests.swift
+++ b/SSHTests/AuthTests.swift
@@ -173,7 +173,7 @@ class AuthTests: XCTestCase {
   func testAgentPartialAuthentication() throws {
     let agent = SSHAgent()
     let key = try SSHKey(fromFileBlob: Credentials.privateKey.data(using: .utf8)!)
-    XCTAssertTrue(agent.loadKey(key, aka: "testKey"))
+    agent.loadKey(key, aka: "testKey")
     
     let config = SSHClientConfig(
       user: Credentials.partialAuthentication.user,