If file has been deleted from disk (or jsch can't find file), but file can be found in remote Favorites tab. Then user can see long IDE freezes (30-60 seconds).

Now I can't reproduce this bug in Solaris(Russia) -> Solaris(USA) case. But at home (Windows 7(Russia) -> Solaris(USA) case) I saw very stable problem.

In order to generate 400 folders and files I use such shell script:
-bash-4.1$ cat test.sh 
#!/bin/sh

for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
do
  for j in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
  do
    mkdir -p root/folder$i/file$j
    touch root/folder$i/file$j/test$j.txt.c
  done
done

Scenario:
- Open Navigator tab
- Expand some remote folder in Favorites tab
- Launch test.sh script on remote machine in external terminal
==> the script finished
- Call 'Refresh Folder' context menu item in Favorites tab
==> 'root' folder appears
- Expand 2-3 folders (for example root/folder1/file1 and folder1/file8)
- Launch 'rm -rf root' in external terminal
==> the command finished

I can see a random long IDE freezes in 3 cases:
1) if I expand new node and files has not icon (IDE checks MIME Type)
2) if I select file in Favorites tab (Navigator should be opened?)
3) double click on file (In this case I see "Do you want to open binary file?" window too)

Also I see a lot of such exceptions:
INFO [nativeexecution.support.logger]: [1820751 ms.] Error Downloading <skipped...>/netbeans_files/folder/root/folder1/file1/test1.txt.in to /var/tmp/sova_ss/var/cache/remote-files/<skipped...>/netbeans_files/folder/root/folder1/file1/test1.txt.in
2: No such file
	at com.jcraft.jsch.ChannelSftp.throwStatusError(ChannelSftp.java:2629)
	at com.jcraft.jsch.ChannelSftp._stat(ChannelSftp.java:2078)
	at com.jcraft.jsch.ChannelSftp._stat(ChannelSftp.java:2095)
	at com.jcraft.jsch.ChannelSftp.get(ChannelSftp.java:853)
	at com.jcraft.jsch.ChannelSftp.get(ChannelSftp.java:813)
	at org.netbeans.modules.nativeexecution.api.util.SftpSupport$Downloader.work(SftpSupport.java:500)
Caused: org.netbeans.modules.nativeexecution.api.util.FileInfoProvider$SftpIOException: No such file
	at org.netbeans.modules.nativeexecution.api.util.SftpSupport.decorateSftpException(SftpSupport.java:200)
	at org.netbeans.modules.nativeexecution.api.util.SftpSupport.access$600(SftpSupport.java:88)
	at org.netbeans.modules.nativeexecution.api.util.SftpSupport$Downloader.work(SftpSupport.java:505)
[catch] at org.netbeans.modules.nativeexecution.api.util.SftpSupport$Downloader.call(SftpSupport.java:450)
	at org.netbeans.modules.nativeexecution.api.util.SftpSupport$Downloader.call(SftpSupport.java:432)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
	at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)