After upgrading to KDE SC 4.4 in Kubuntu, sftp:// URLs no longer works in Dolphin or Konqueror. Both gives an error message saying "Out of memory". It seems to do this on every sftp URL, regardless of whether they should work.

Is this a known bug in KDE, or perhaps Kubuntu-specific? Any known workaround?

Could you please try the following in Konsole, and post the output?

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kioclient copy sftp://user@host/path/to/file ./

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$ kioclient copy sftp://my.server/path/to/some/file.txt ./
<unknown program name>(27666)/ ClientApp::doIt: Creating ClientApp
kioclient(27666) KSharedUiServerProxy::KSharedUiServerProxy: kuiserver registered
kioclient(27666)/kdecore (KSycoca) KSycocaPrivate::openDatabase: Trying to open ksycoca from  "/var/tmp/kdecache-haakon/ksycoca4"
kioclient(27666)/kio (Slave) KIO::Slave::createSlave: createSlave "file" for KUrl("file:///home/haakon/")
kioclient(27666)/kio (KIOConnection) KIO::ConnectionServer::listenForRemote: Listening on  "local:/tmp/ksocket-haakon/kioclienth27666.slave-socket"
kioclient(27666)/kio (Slave) KIO::Slave::createSlave: createSlave "sftp" for KUrl("sftp://my.server/path/to/some/file.txt")
kioclient(27666)/kio (KIOConnection) KIO::ConnectionServer::listenForRemote: Listening on  "local:/tmp/ksocket-haakon/kioclientn27666.slave-socket"
kioclient(27666)/kio (KIOJob) KIO::SlaveInterface::dispatch: error  144   ""
kioclient(27666)/kio (KIOJob) KIO::CopyJobPrivate::slotResultStating: Error while stating source. Activating hack
kioclient(27666)/kio (KIOConnection) KIO::ConnectionServer::listenForRemote: Listening on  "local:/tmp/ksocket-haakon/kioclientT27666.slave-socket"
kioclient(27666)/kio (KIOJob) KIO::SlaveInterface::dispatch: error  144   ""
kioclient(27666)/kio (Slave) KIO::Slave::kill: killing slave pid 19286 ( "file://" )

Then I get a GUI dialogue box saying "Error. Out of memory." with a Cancel button and window title "Information".

If I try to copy the other way, the same thing happens.

Since KDE 4.4 kio_sftp uses libssh >= 0.4 for the job.
Yesterday libssh 0.4.1 was released, so you could try to update it and see whether the problem persists.

I have the same error and I'am using libssh 4.1.
My system is Gentoo and I have recompiled libssh, dolphin and kdebase-kioslaves various times without change in behavior.
Dolphin and kdebase-kioslaves are at version 4.4.0.
The 4.3.* versions have worked without problems.

libssh 4.1 doesn't exist... please make sure you are using the correct sources..

Note that following the recompile, you may wish to run the following ( as your user ):

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kbuildsycoca4 --noincremental
kdeinit4 &

I'm sorry, of course I mean libssh 0.4.1.
I tried the commands given, and seeing the output of kdeinit4 showed the following:

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kio_sftp(10192) sftpProtocol::openConnection: Creating the SSH session and setting options
Unsupported option: ServerAliveInterval, line: 1
Unsupported option: ServerAliveCountMax, line: 2
Unsupported option: ForwardX11, line: 5
Unsupported option: ForwardX11Trusted, line: 6
ERROR - unimplemented opcode: 5

My .ssh/config file is

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ServerAliveInterval 10
ServerAliveCountMax 3

Host ########
    ForwardX11 yes
    ForwardX11Trusted yes
Host #########
    IdentityFile ~/.ssh/id_rsa2_%r
    Cipher blowfish-cbc


Which works perfectly with the commandline sftp client from openssh.
When I change my config to

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ServerAliveInterval 10
ServerAliveCountMax 3

Host ########
    ForwardX11 yes
    ForwardX11Trusted yes
Host #########
    IdentityFile ~/.ssh/id_rsa2_%r
#    Cipher blowfish-cbc


The "Out of memory" error disappears and I can connect and browse the remote host. But dolphin asks for a password, where the commandline sftp client doesn't. The keyfile has no password associated and I'm not using any keyagent, so it seems that the sftp kio ignores the IdentityFile line.
The other lines still give an "Unsupported option" warning, but the "Out of memory" error seems to come from the "Cipher blowfish-cbc" line.

Can you please report these issues to the libssh developers so they can correct them?

Is reported at http://dev.libssh.org/ticket/61

I have a similar problem where I get 50+ entries of kio_http each using 16mb of ram showing in the system monitor. Given enough time this will increment to the point of being out of memory or in a failure of the ability to launch applications.

@jimbo99: That is a completely different issue altogether. And how did you arrive at that statistic? It is likely you used top or free which are known to incorrectly calculate memory usage. KSysGuard and Exmap are some of the few utilities which get it correct.

I also get an Out of memory error when using sftp with Dolphin. I run Debian Sid with KDE SC 4.4.2

In contrary to Polytheus I do not have a SSH config file thus it cannot be the origin of the problem for me. Now I do have id files for authentication by certificates

Authentication by SSH Key works fine here, so it should work in your case.

I had this problem too, although only on accessing certain servers. I then came across this post.

I remembered I had a ~/bin folder which is added to the path automatically via ~/.profile these days in (k)ubuntu. I renamed that folder to test and re-logged in and the problem is solved.

Not sure why this has suddenly started occurring, but it is a good opportunity for me to sort through all my custom scripts and make a .deb that installs them properly!

Hope this helps, will provide more info if required.