Programming over network fails

Hi,

I can program my Yun fine over USB, but over the network it fails. I get asked for a password and then it crashes with the following stack trace:

Sketch uses 8,122 bytes (28%) of program storage space. Maximum is 28,672 bytes.
Global variables use 372 bytes (14%) of dynamic memory, leaving 2,188 bytes for local variables. Maximum is 2,560 bytes.
processing.app.debug.RunnerException
	at cc.arduino.packages.uploaders.SSHUploader.uploadUsingPreferences(SSHUploader.java:144)
	at cc.arduino.UploaderUtils.upload(UploaderUtils.java:78)
	at processing.app.Sketch.upload(Sketch.java:1187)
	at processing.app.Sketch.exportApplet(Sketch.java:1160)
	at processing.app.Sketch.exportApplet(Sketch.java:1132)
	at processing.app.Editor$DefaultExportHandler.run(Editor.java:2409)
	at java.lang.Thread.run(Thread.java:745)
Caused by: com.jcraft.jsch.JSchException: session is down
	at com.jcraft.jsch.Session.openChannel(Session.java:843)
	at cc.arduino.packages.ssh.SSH.execSyncCommand(SSH.java:59)
	at cc.arduino.packages.ssh.SSH.execSyncCommand(SSH.java:51)
	at cc.arduino.packages.uploaders.SSHUploader.runUploadTool(SSHUploader.java:158)
	at cc.arduino.packages.uploaders.SSHUploader.uploadUsingPreferences(SSHUploader.java:135)
	... 6 more

I don't understand if I can update my Yun to 1.6.2 since I have a quite old one. I tried anyway, and it accepts the image file, but gives me an error when using the web-based updater.

Firmware Version OpenWRTYun Attitude Adjustment 1 / LuCI 0.11 Branch (0.11+svn9964)
Kernel Version 3.3.8

Any hints for how to proceed?

Thanks
Marius

I just tried it on a different computer and it works. Weird, but I will just use that to program it.