SOLVED Dolphin sftp - "Unable to request the SFTP subsystem"

gkmac · Last edited by gkmac on Sun Mar 30, 2014 10:02 pm; edited 1 time in total

All of a sudden I can no longer browse files on my server and MythTV box using KDE Dolphin's sftp kioslave.

For the longest time I could type (as an example) "sftp://servername.domain" and after a password prompt have it connect. Now all I get is a red banner at the top saying "Unable to request the SFTP subsystem. Make sure SFTP is enabled on the server."

Except that SFTP is enabled on my server. I think, since typing sftp servername.domain on the command line lets me in successfully.

Any ideas?
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666threesixes666 · Posted: Tue Jan 14, 2014 9:24 pm Post subject:

id further test. id test ssh between the two machines. then loop back ssh tests on local machines. to start tracking down the problem. id look to see if you can roll back your dolphin in versions to where it works if everything on the ssh end is working.

https://wiki.gentoo.org/wiki/Troubleshooting

Voltago · Posted: Wed Jan 15, 2014 1:06 am Post subject:

Seeing the same behavior here... As a workaround, you can just use the 'fish' protocol instead.

666threesixes666 · Posted: Wed Jan 15, 2014 5:45 am Post subject:

the internet says gftp is also an acceptable alternative. i guess i should put up a note on using ssh keys working for sftp logins.

for me its domainname.com port blank user password blank (because of ssh keys) and ssh protocol and enter and connected with gftp.

ivan2k · Posted: Sun Jan 19, 2014 10:33 am Post subject:

I have the same problem with dolphin, but it's not a dolphin bug because even xbmc can't connect to sftp server. Fish protocol work.
This happen after upgrade openssh from 5.9 to 6 on the server.
Anyone know if there is some changes on openssh 6 ?

Chris W · Posted: Wed Feb 12, 2014 4:32 am Post subject:

I have this issue with KDE 4.11.5. This appears to be a libssh (used by KDE) and OpenSSH server version mismatch issue.

I have two servers. With Dolphin and sftp: URL I can access the server running OpenSSH 5.9 but get the "Unable to request the SFTP subsystem. Make sure SFTP is enabled on the server" message accessing the server running OpenSSH 6.4. I can access either machine from the command line using OpenSSH 6.4's sftp client. My client is running libssh 0.55, the latest stable at time of writing.

Updating to the unstable libssh 0.6.0 changes the error to:

Chris W · Posted: Sat Mar 08, 2014 6:18 am Post subject:

Upgrading to net-libs/libssh-0.6.3 (unstable at time of writing) on the KDE machine fixed the interoperability problem with OpenSSH 6.4
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gkmac · Posted: Tue Mar 25, 2014 5:51 pm Post subject:

net-libs/libssh-0.6.3 indeed went stable a couple of weeks ago.

But sftp:// is still not working for me. Now I get "Error. Out of memory. Could not set a timeout."

"free -m" shows that I have three gigabytes of memory free, so somehow the "out of memory" part of the message is a bit of a lie...
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If ~amd64 ebuilds are cutting edge, then git-9999 ebuilds are chainsaws.
"Not everyone can ride a unicycle, does that mean we should put another wheel on it?" - Lokheed

TomWij · Retired Dev Joined: 04 Jul 2012 Posts: 1553

gkmac · Posted: Sun Mar 30, 2014 10:02 pm Post subject:

Hmmm... just tried sftp again for the first time in a few days, and it seems to be working fully again.

Dunno what changed it from not-working to working, nevertheless I'll mark this SOLVED.
_________________
If ~amd64 ebuilds are cutting edge, then git-9999 ebuilds are chainsaws.
"Not everyone can ride a unicycle, does that mean we should put another wheel on it?" - Lokheed